A creature from the Roberts family in the Genus Micheal. The yellow bellied sack sucker is a creature of the night. Found in dark alleys sucking only the dirtiest smelliest sacks. If you make eye contact with this creature you could vomit from its nastiness.
I was walking home last night from the bar when I saw it! “The yellow bellied sack sucker” was grunting and sucking so many sacks! It was terrible!
When a female bends forward at the waist with her legs held tightly together, revealing a petruding labial skinpatch that closely resembles a tightly binded "sack of suckers"
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.