(1) Party Jar: A jar that one keeps full of condoms of different varieties for special occasions.
(2) Party Jar: A jar of condoms that's used at parties full of different sized/variety/flavored condoms that people help themselves to.
(3) Party Jar: A large jar of condoms, comprised of condoms of different sizes, flavors, varieties etc.
Matt: "Yo' John, man.. Where 'dem rubbers at?"
John: "Ite man.. over there, my party Jar.."
Matt's Biatch: "Mmmmmhmm"