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1.
Axillary intercourse, or to fuck someone's armpit. Big in Europe. Preferably sweaty.
Andy soon discovered that banjoing Gina would be nigh impossible in the back of his BMW.
by dole23b August 14, 2006
 
2.
When you have to take a big dump but cant because you are indisposed, and a slight tingly feeling can be felt on your butt hole that feel like vibrations that are produced when a banjo is played.
I have a huge turtlehead that is starting to banjo

my butt hole feels like it is playing a banjo

Im banjoing so bad right now I might squeal like a pig.
by whoisblank1 April 13, 2010