A croger is a person who spends the night at a friends house, and gets a boner so has to jack off behind your couch or somewhere private, while you sleep.
It can also be used as a verb, as in "I crogered in your closet last night", or "Stop crogering under my bed im trying to sleep".
Pronounced crogers, (same sounding g like in german), not croggers.
Guy one: "Dude dont invite Ryan to your house, hes such a crogers."
Guy two: "Well youre not one to talk, remember that time you crogered all over the back of my couch?!"
Guy one: "Ya well that was cuz your sister was super hot ok, ryan does it at my house, and i dont have a sister, so hes either jacking off to me or my mom or something".
Guy two: "dayam".