"what took you so long, were you out back doing the five knuckle chuckle?  "she was so hot, i had to do a five knuckle chuckle when i got home
a slang term used for male masturbation
""what took you so long, were you out back doing the five knuckle chuckle?  "she was so hot, i had to do a five knuckle chuckle when i got home" What is the definition of "five knuckle chuckle"?