From Longman Dictionary of Contemporary Englishweirdoweird‧o /ˈwɪədəʊ $ ˈwɪrdoʊ/ noun (plural weirdos) [countable] informalSTRANGECRAZY someone who wears strange clothes or behaves strangely Jenny’s going out with a real weirdo.
Examples from the Corpus
weirdo• There's a weirdo who stands in front of the store and talks to himself.• There's always a bunch of weirdos around the train station.• When I travel by underground I always seem to end up sitting next to some weirdo.• You want some weirdo skulking around the aisles, spraying toxic chemicals all over the place?• I was always considered the black sheep of the family, the weirdo in the group, right?• If the weirdo had kicked her out, well and good.• At primary school I was the weirdo in the corner with the funny little thingy.• The weirdo in the hat, whoever he might be, is the weirdo in the hat. 