The shit smear left on the back of the toilet seat. Commonly caused by explosive diarrhea or incorrectly positioning your asshole.
"At last year's company holiday party I got so drunk I accidentally left a grease shingle."
"I took this girl home from the bar last night, when I woke up she was gone...but the skank left me a grease shingle as a parting gift." #greaseshingle
"Donald Trump's hair looks like a grease shingle."
"Grease Ball" or more commonly used now "Nadsludge" is a slimy substance that occurs on male genitalia after performing either anal or vaginal intercourse on a female. The Ball "grease" worsens as male hygiene declines.
Tyler Kamin never showered and only fucked hoes. Thats why he got the Grease Ball!
Doing a hair flick after you haven’t washed your hair in a week so all of the grease comes off and lands on your dick. Then you use this grease as lube and perform intercourse on a female.
Matt: Look at this picture of a girl I took home the other night
Owen: Damn bro she’s a baddie. What did you do with her?