Top Definition
one who interjects randomly, interrupting someone in a conversation, like a cow who is full of milk and lactates spontaneously.
Thomas: Bro. you won't believe what happened to me last night, I was driving home and....
Gilbert: Yo you wanna hear a dead baby joke.
Thomas: Stfu and let me talk don't be a fucking lactating cow.
by D3RTYS4NCH3Z July 30, 2008

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