Inner city Welsh and
British expression for the Police. Typically it refers to undercover officers, however. It is very likely a derivation from "Bobbies."
Often this expression is used as a codeword for an investigator at a
party or club, as saying "watch out for
Bob" is much less conspicuous than saying "watch out for the police."
"Out the back! Shit! There'
s a pair of buggered Bobs hear."
I heard Kate got arrested last
night. A
Bob caught her dealing.