A long and girthy penis. Like a baby arm in length, but also extremely thick.
Pericles: So I heard you got his big donny last night. I told you it was a baby arm!
Carin: You weren't kidding that his cock is huge! You should know, though, that it is really a baby thigh. I think I might be permanently stretched out and need a daddy stitch. AND I had to stretch my mouth so wide to give him a bj that my jaw now pops.
A "Thigh Baby" acures when a male "pulls out" before ejaculating and the "left-overs" get on her thigh. Then by accident, or on purpose, some sperm gets into the vaginal area. Affect of this being a baby. This also explains that some virgins can get pregnant, if under the right curcumstances.
Brad: I don't know what happended, I pulled out but she still got pregnent.
Josh: Looks like you got a thigh baby, that sucks.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"