| Abbreviation | Definition |
|---|---|
| NIKE | Not Innovative Kicking Exercise |
| NIKE | Not Into Kicking Elves |
| NIKE | Not Into Kinky Experiences |
| NIKE | Now Islamic Kingdom on Earth |
| NIL | Netball Is Lame |
| NIL | Netbus Is Lame |
| NILK | No Income Lots of Kids |
| NIM | National Idiot Movement |
| NIMA | Nunivak Is Mekoryuk Alaska |
| NIMBY | Never Intervening Maliciously Before Yesterday |
| NIMBY | Nuclear Infants May Blast You |
| NINA | No Irish Need Apply |
| NIOSH | Needlestick Initiative For Occupational Standards and Health |
| NIPC | Ninkompoops In Plain Clothes |
| NIPPLE | Nolife Involved People Practicing Loserly Extravaganzas |
| NIRA | No Idiots Read Avidly |
| NIS | New In Shrink |
| NISSAN | Neatly Installed Sheet Steel Around Nothing |
| NISSAN | Needs Immediate Service Soon As New |
| NISSAN | Nifty Individuals Start Spaying And Neutering |