Definitions by The Fritz Machine!

nelson 

the act of fondling a males testicles (preferably sweaty testicles) while inserting your forearm up to your elbow into their anal cavity.

eliot: Dude im so bored and we got no buds left.... what can we do?
fergal: Wanna crack a phat nelson?
eliot: Fuck yea man build up a sweat and well pull a nelson!

nelson by The Fritz Machine! March 1, 2009