Describes a girl with a bum that's so sexy that makes your mouth water.
spectacularse should be spoken with syllabic emphasis;

GARY: <drool>
LARY: ZOMG! That chick is spec-tac-ul-arse!
GARY: Could you pass me a tissue please? Actually, better make it two, thanks Lary.
LARY: Jesus wept, Gary! Keep it in your pants!
by niftydog September 16, 2008
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