When you get a incredibly rock hard erection. Sometimes in the morning or when you’ve become turned on by something a bit kinky like an older lady whose showing a lot of cleavage.
Sometimes referred to as a ‘stonk on’
I’ve got a right stonker in my underwear after seeing her milf tits wobble in her low cutdress
A male or female with an abnormally large penis whose bulge is often visible.
Example1
Girl1: Ewww, I would never date that guy.
Girl2: Well i know i would. See that bulge in his pants? He's clearly a slongker.
Girl1: Well now that you mention it....
Example2
Guy1: Gosh I don't know what to do. My dick keeps hitting my knee when i run.
Guy2: Gross man, I don't want to hear your slongker problems.
Example3
Guy1: That girl over there is totally a slongker.
Guy2: I didnt know girls had penises.
Guy1: ...They dont...usually.
Guy2: Wha?