some one who does or says sketchy things. overly sketchy, suspicious.
ruby: OMG guess what matt told me last night?
catherine: what?
ruby: he said we should go to the woods at night
catherine: what a sketch monster!
Someone who is doing something wrong and is being obvious or looking guilty.
Somone is dealing crack in front of a cop. "look at that sketch monster!"
10👍 2👎