Definitions by Way she goes

Greasy 

Slang popularised by the tv programme Trailer Park Boys, occasionally used in Canada's Maritime provinces. Used to describe an activity/event engaged in which, if generally known to others, would bring shame and/or ridicule from peers. To do something that generally is considered immoral, dishonest, or illegal.

Randy: I banged Lucy and knocked her up, no big deal.

Barb: Ugh, that was you? Greasy!

Greasy by Way she goes July 25, 2010