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4.
noun: People who like buses, typically taking many photos of buses to later put onto a forum and share with other bus nuts. It is their obsession.

Brad is such a bus nut, he takes his camera everywhere in case he will see one!
by stonedfly December 20, 2008
 
1.
A crazy or outspoken person on the bus (or train or other public transportation). A person who acts out their own private dramas on the bus, talks to the voices in their head, or otherwise puts on a show for other passengers (see also, Bus Drama)
Some busnut started yelling at a tourist on the subway for bumping into him.
by michaelp August 13, 2011
 
2.
When semen is released from the penis
Yo Blood i bus nuts on that chicks top lip
by Bukaman August 05, 2006
 
3.
Instead of saying, you cant cum, you cant bus nut
Arrrrr no, face it, you cant bus nut
by Mc_Dizzee December 08, 2004