A gesture used for commical effect in which a male shakes his pelvis so that his penis repeatedly hits his pants. Invented by a community college student in Pasadena, CA.
Bob showed everyone what he was made of with a banana shake.
by JSL_LMB October 24, 2006
When u shove your erection in your lovers asshole, you ejaculate once and then proceed to piss in his ass thus fourth creating a banana shake.
My gay lover was so hungry, that I made him a banana shake to snack on!
by Woodbox Buddy August 08, 2006