An always-stiff-penis. A penis of such small stature, it fails to have the length to hang down, hence, being always stiff.
Also known as, an Always Stiff "Peeper," rather than penis.
Example: I was changing in the locker room today with the guys, then I looked of at Tommy, an he was sporting a tiny dick
, possibly an A.S.P (Always Stiff Penis).
Example: Dude, after I banged her, I took a cold shower, and came out. She threw off the towel because she wanted to give me head
. She looked up and said, where'd it go? I must have an A.S.P (Always Stiff Penis).