| I 1-D-R | I Wonder |
| I&I | Intercourse & Inebriation |
| IAC | In Any Case -or- I Am Confused |
| IAE | In Any Event |
| IAITS | It's All In The Subject |
| IANAC | I Am Not A Crook |
| IANADBIPOOTV | I Am Not A Doctor But I Play One On TV |
| IANAE | I Am Not An Expert |
| IANAL | I Am Not A Lawyer |
| IANNNGC | I Am Not Nurturing the Next Generation of Casualties |
| IASAP4U | I Always Say A Prayer For You |
| IAT | I Am Tired |
| IAW | I Agree With |
| IAYM | I Am Your Master |
| IBGYBG | I'll Be Gone, You'll Be Gone |
| IBIWISI | I'll Believe It When I See It |
| IBRB | I'll Be Right Back |
| IBT | In Between Technology |
| IBTC | Itty Bitty Titty Committee |
| IBTD | I Beg To Differ |
| IBTL | In Before The Lock |
| IC | In Character -or- I See |
| ICBW | I Could Be Wrong |
| ICYC | In Case You're Curious -or- In Case You Care |
| ID10T | Idiot |
| IDC | I Don't Care |
| IDGAF | I Don't Give A F*** |
| IDGARA | I Don't Give A Rats Ass |
| IDGI | I Don't Get It |
| IDK | I Don't Know |
| IDK, my BFF Jill | I Don't Know, my Best Friend Forever Jill |
| IDKY | I Don't Know You |
| I-D-L | Ideal |
| IDM | It Does Not Matter |
| IDST | I Didn't Say That |
| IDTA | I Did That Already |
| IDTS | I Don't Think So |
| IEF | It's Esther's Fault |
| IF/IB | In the Front -or- In the Back |
| IFAB | I Found A Bug |
| IFU | I F***ed Up |
| IGGP | I Gotta Go Pee |
| IGTP | I Get The Point |
| IHA | I Hate Acronyms |
| IHAIM | I Have Another Instant Message |
| IHNO | I Have No Opinion |
| IHTFP | I Have Truly Found Paradise -or- I Hate This F***ing Place |
| IHU | I Hear You |
| IIIO | Intel Inside, Idiot Outside |
| IIMAD | If It Makes An(y) Difference |
| IIR | If I Remember -or- If I Recall |
| IIRC | If I Remember Correctly -or- If I Recall Correctly |
| IIT | Is It Tight? |
| IITLYTO | If It's Too Loud You're Too Old |
| IITYWIMWYBMAD | If I Tell You What It Means Will You Buy Me A Drink |
| IITYWYBMAD | If I Tell You Will You Buy Me A Drink |
| IIWM | If It Were Me |
| IKALOPLT | I Know A Lot Of People Like That |
| ILA | I Love Acronyms |
| ILF/MD | I Love Female/Male Dominance |
| ILICISCOMK | I Laughed, I Cried, I Spat/Spilt Coffee/Crumbs/Coke On My Keyboard |
| ILU | I Love You |
| ILUAAF | I Love You As A Friend |
| ILY | I Love You |
| IM | Instant Messaging -or- Immediate Message |
| IM2BZ2P | I aM Too Busy To (even) Pee |
| IMAO | In My Arrogant Opinion |
| IMCO | In My Considered Opinion |
| IMEZRU | I Am Easy, Are You? |
| IMHEIUO | In My High Exalted Informed Unassailable Opinion |
| IMHO | In My Humble Opinion |
| IMNERHO | In My Never Even Remotely Humble Opinion |
| IMNSHO | In My Not So Humble Opinion |
| IMO | In My Opinion |
| IMOO | In My Own Opinion |
| IMRU | I Am, Are You? |
| IMS | I Am Sorry |
| INMP | It's Not My Problem |
| INNW | If Not Now, When |
| INPO | In No Particular Order |
| INUCOSM | It's No Use Crying Over Spilt Milk |
| IOH | I'm Outta Here |
| ION | Index Of Names |
| IOUD | Inside, Outside, Upside Down |
| IOW | In Other Words |
| IPN | I'm Posting Naked |
| IRL | In Real Life |
| ISAGN | I See A Great Need |
| ISH | Insert Sarcasm Here |
| ISO | In Search Of |
| ISS | I Said So |
| ISTM | It Seems to Me |
| ISTR | I Seem To Remember |
| ISWYM | I See What You Mean |
| ISYALS | I'll Send You A Letter Soon |
| ITA | I Totally Agree |
| ITIGBS | I Think I'm Going To Be Sick |
| ITM | In The Money |
| ITS | Intense Text Sex |
| IUM | If You Must |
| IWALU | I Will Always Love You |
| IWBAPTAKYAIYSTA | I Will Buy A Plane Ticket And Kick Your Ass If You Say That Again |
| IWIWU | I Wish I Was You |
| IWSN | I Want Sex Now |
| IYAOYAS | If You Ain't Ordinance You Ain't Sh** |
| IYD | In Your Dreams |
| IYKWIM | If You Know What I Mean |
| IYKWIMAITYD | If You Know What I Mean And I Think You Do |
| IYO | In Your Opinion |
| IYQ | I like you |
| IYSS | If You Say So |
| IYSWIM | If You See What I Mean |
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