| Abbreviation | Definition |
|---|---|
| IFLYSM | I Freaking Love You So Much |
| IFMO | Is For My Information |
| IFMY | I Frankly Miss You |
| IFO | I Fell Off |
| IFO | In Favour Of |
| IFR | Ideal Final Result |
| IFS | I Feel Special |
| IFSU | I Feel So Used |
| IFTFY | I Fixed That For You |
| IFU | I Forgive You |
| IFY | I Feel You |
| IFYPFY | I Fixed Your Post For You |
| IG | I Get |
| IG | Inadequate Guys |
| IG | Instant Gratification |
| IGA | I Get Attention |
| IGFN | I Got F'n Nothing |
| IGH | I'm Going Home |
| IGHT | I Give Head Tonight |
| IGI | I'm Going Insane |