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any substance, alcohol or otherwise, that enhances a party. similar to performance enhancing substances in the fact that they are sometimes illegal, and that many people are against them(depending on age).
my good friend captain morgan is a party enhancing substance

mike snuck us in some party enhancing substances in his flask

the party was pretty lame, then we got some party enhancing substances and found the trampoline
by deebeecee April 21, 2009
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