The resultant 'stiffening' of your 'broomstick' that comes from watching all these fine ass young witches finally reach the legal wizarding age.
Seamus: Hey, did you see that Hermione last night down at the Three Broomsticks?

Neville: Hells yeah bro! She gave me such a hardcore case of Quidditch Pants it was like she'd preformed petrificus totalus on my wang!!!
by pro-fezzor July 18, 2010
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