A fork of Rural Dictionary
Adj. Someone or something that acts or appears to be especially suspicious, very unpredictable, overly secretive, deceptive, or requires caution.
"Hey, let's take this shortcut." "No way, that dark, abandoned alley is sketchXL!" "Hey, have you seen my friend?" "I saw him leaving with that guy who was wearing the necklace made of teeth; that guy was sketchXL".