When two people of any sex completely cover themselves in olive oil and rub against each other then you put a bodily fluid of your choice in the persons mouth they wash it around they spit it in your mouth and add something else. It keeps going back and forth until one of you quits at that point the winner gets oral. Also known as S.S.S
Night Sky: Hey Sky!
Sky: Night Sky!
Why are you here?
Night Sky: I just wanted to tell you that I did a slippery slug last night.
Sky: No wonder you're my brother!
(vomits)
The act of the man having to get up and go find a cum rag when nobody thought to get one ahead of time. Named as such because there is usually a slug trail from the bed to where the guy finds the necessary absorbent item. Often a t-shirt or towel is the first thing they find.
Ginger forgot to get a cum rag, so Chad had to resort to walking the slippery slug to the hamper to grab a shirt.