When you think that something came out of your ass but your not really sure. Usually its a minimal amount of liquid too small to notice a signifigant change of the moistness of your underwear.
Jamal:Hey man I think I just leaked out of my ass
Me: Oh shit was it taco night last night again?
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.