| Acronym | Meaning |
 | I1DR | I Wonder |
| IAC | In Any Case |
| IAC | I Am Confused |
| IAE | In Any Event |
| IAITS | It's All In The Subject |
| IANAC | I Am Not A Crook |
| IANAE | I Am Not An Expert |
| IANAL | I Am Not A Lawyer |
| IASAP4U | I Always Say A Prayer For You |
| IAT | I Am Tired |
| IAW | I Agree With |
| IAW | In Accordance With |
| IAYM | I Am Your Master |
| IB | In (the) Back |
| IBGYBG | I'll Be Gone, You'll Be Gone |
| IBIWISI | I'll Believe It When I See It |
| IBK | Idiot Behind Keyboard |
| IBRB | I'll Be Right Back |
| IBT | In Between Technology |
| IBTD | I Beg To Differ |
| IBTL | In Before The Lock |
| IC | I See |
| IC | In Character |
| ICBW | I Could Be Wrong |
| ICYC | In Case You Care |
| ICYC | In Case You're Curious |
| ID10T | Idiot |
| IDC | I Don't Care |
| IDGAF | I Don't Give A F*ck |
| IDGARA | I Don't Give A Rats Ass |
| IDGI | I Don't Get Involved |
| IDGI | I Don't Get It |
| IDK | I Don't Know |
| IDKY | I Don't Know You |
| IDM | It Does Not Matter |
| IDST | I Didn't Say That |
| IDTA | I Did That Already |
| IDTS | I Don't Think So |
| IF | In (the) Front |
| IFAB | I Found A Bug |
| IFU | I F*cked 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 Hate This F*cking Place |
| IHTFP | I Have Truly Found Paradise |
| IHU | I Hear You |
| IIABDFI | If It Ain't Broke, Don't Fix It |
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