a sackeater is a mentally unstable, sometimes schizophrenic even, person who often "glaze" or "meat ride" similarly unwell peoplelike a SHAP15C. They're talkative by nature and will either gossip others or praise a SHAP15C that they know personally and will hardly stop until their social battery runs out.
Dude how much of a sackeater are you?! you've been talking about the local SHAP15C for the past 3 hours!
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.