Nippleonlyann Complex is an informal term describing an alleged type of inferiority complex which is said to affect some people, especially women, who are small breasted in stature. The term, similar to Napoleon complex is also used more generally to describe people who are driven by a perceived handicap to overcompensate in other aspects of their lives.
When a musician, especially a bassist, has their strap adjusted in such a way that their instrument and thus strumming or plucking is at nipple height.
When a bloke has half a hard on and sits down to take a piss. He adjusts on the seat to stop getting piss all over the place and his nob slips under the rim of the seat, thus when he sits back down he squashes his nob between the seat and the rim.
Nob nipping - usually happens in the morning after a hard nighton the piss, or after a shag or to blokes that are well endowed. May in fact be the only down side to having a huge penis.