Traditionally used at the end of a statement in order to suggest strong or complete agreement pertaining to the legitimacy of the content, topic, or issue at hand.
a random person with a slanted head.
he is rebelious especiously in mrs breens r.e class of year nine A 2.
a bent head likes and is good at maths, and thinks languages and r.e r pointless.
Person1: Mark already owns three jaguars and he was lucky enough to win the lottery yesterday, that shit ain't right.
Person2: Yea, that's some bent shit alright.
Person1: They should really put a sign warning for wet cement.
Person2: Indeed. Bent shit.
Person1: Yea
British slang, "bent" being slang for gay, and a "nine bob note" being a fictitious currency ("bob" is slang for shilling, or post-decimalization, a five pent coin).
Similar to US slang "queer as a three dollar bill".