Something that can not or should not be thrown out
Guy 1: Do you need this tattered jersey anymore
Guy 2: NO WAY! That's Unbethrowable!
When you are making sweet love to a girl and all you can produce is a droplet of cum (You are not a man)
Girl: What was that?
Guy: I only gave you a tiddle wink
Girl: I think we should see other people
An action that causes someone to give props to the person who did the action
Guy 1: Man, I skipped a stone on that lake like 17 times!
Guy 2: Yeah I saw, that was so proppable
When you suck your own dick while your girl licks her pussy while listening to Stacy's Mom by Fountains of Wayne and record it to send to Harvy Weinstein
Guy 1: John looks happy today
Guy 2: Well, I heard last night his girlfriend agreed to have a Hammy Sammy Harvy Stacy Party
Guy 1: Lucky bastard