Top Definition
When two women who are lactating bump breasts until one of them squirts milk. The woman who squirts milk first loses.
Katie3 is the Milkshake Battle Champion because she defeated Katie1 in the heated Milkshake Battle. Katie3 won the milkshake battle because Katie1’s nipples released milk sooner than Katie3’s nipples.
by Word Templar February 03, 2011

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