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
cut dress
I’ve got a stonk on and I need to knock on out.