The resin that collects around the mouth-piece of a dirty, old bong and can sometimes get onto the lip/tooth of an unsuspecting victim.
"Rick alwayz attracts super-smeg on the bong, yo' fully gotsta clean the mouth-piece before you smoke out of it."
"Hahaha. You jus' got harcore-smeg on your tooth from that cone."
"Yeah. I waz fully fucked up last night and ended up hiking home from the City by myself. I got home at 11:00am."
"It's the full 'hike' to my house form here man, can I get a lift back?"