In the game Counter Strike Source, a counter terrorist is skum (worthless garbage that needs to be humiliated and sliced into little pieces with a knife).
Of or relating to the group of bmx'ers characterized by greasy hair, shitty attitudes, often missing front two teeth, in times poor education and grammar, and are more commonly found residing in Arizona. Can also refer to something as being "skummy."
also:
skum of the earth skum love
pond skum
skum cave/lair
Adjective used to describe a creature as a awkwardly blossomous positive contributed to a squad or kick line team. Great sense of humour and taste in clothing. Enjoys 5sos and flannels. Daddy kink. Christmas AF. Not to be confused with scum
Skum: Bye I have to go to seventh period.
Tori: Stay skummy!
Kiki: As if she wouldn't??