Hung like a gerbil
Someone with an extremely small penis.
Dude, is that a tic-tac in your pocket or are you hung like a gerbil???
hung like a bull gerbil
It is simply the opposite of being hung like a gerbil. A man with small genitals. But if he says it about himself he is a confident man who hits the G-spot everytime.
I am hung like a bull gerbil, i hit the g-spot everytime.