Suspicious, doubtful about something.
It makes you a bit leery when someone wants to sell you something at a ridiculously low price.
when one of your mandems gets a bit touchy and often gets aggressive.
Joe : You just got merked
Billy : Oit, dont get leery
an adjective used to descibe a person, in particular and old(er) man who most commonly has a slightly stained and off white vest and is looking over his glasses at a young and attractive girl that he knows he will never have a hope in hell of getting but is gonna have a nice, long stare from a distance anyway.
" girls pull your skirts down and button up your coats; the leery old man is at the school gate again"