Top Definition
Any ceremony, real or imagined, that worships or mourns an outstanding set of breasts.
Joe: "Dude, remember Jane from back in High School? Saw her in town today."

Bob: "Yeah, she had a great rack! How'd she look?"

Joe: "We'd better have a Mammorial, cause they were hangin' so low you couldn't see her belt!"
by RocketmanKarl February 23, 2010
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