A estimation, often influenced by inebriation or equal mental hinderance, of a woman's observed bra size from a male perspective. Often used/found in places like college bars, night clubs, gentleman's clubs, etc.
Estimating the qualities of a woman's breast, in size, shape and elasticity.
Two guys are in a bar and one says, "Hey dude! Check out her twins... What do you think?". The second guy says, " Well, in my breastimation they are heavenly!".
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?"