When you begin reading a page, and blank out thinking about other things. You finally come to, realizing that you read the whole page without ingesting a single word.
She was reading statistics homework when she suffered an acute case of monkey brain. I suppose thats what happens when you do your homework tipsy on the stairs in front of your building at 2:30 AM.
by the girl on the stairs. September 03, 2009
When you pull ur nut-sack out of ur pants/shorts while keeping ur dick in ur pants, thus makeing them look like a monkeys brain
by Rob Echlin July 22, 2004
Adjective: Used to describe when you cannot make sense of something, or to describe a person most commonly your friend that has said some dumb shit or is dumb.
by nahor macca November 02, 2020
by YourMumLover666 May 24, 2021
Grab the scrotum sac and squeeze it from the base tightening the skin around the testicles. The result is a perfectly formed miniature "brain".
by Bret Austin September 10, 2004
by mooseknuckles November 11, 2002