A saying used to demean an unattractive or undesirable object, also and commonly referring to those of the opposite sex.

An adjective

can also be used to describe a situation
Phoenix: where's your birthday party at mate?
Alex: Ashley's house
Phoenix: Messy bits

Alex: Did you see that time the postman threw up all over his jeans?
Phoenix: yes mate Messy bits!
Alex:messy bits indeed brosé
Phoenix: yeah Don't Whitey in the hedge postman!
by ehhhh dickhead May 3, 2011
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