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The urge to pee created when in the presence of others who need to urinate or are urinating.

Often used in cases of inebriation where one individual "breaks the seal" and brings everyone's attention to their own bladders causing many subsequent bathroom trips.

Also used when girls go to the washroom together during a night out whether or not they all had to go in the first place.
"Man, it's the peeflex, now I gotta go too".
via giphy
by Juicy J 613 February 12, 2017
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