Lactating Cow 

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.

Lactating Cow by D3RTYS4NCH3Z August 27, 2008

Cow Lactation 

The white, warm liquidy substance that is projected out of a female cow's udders when tenatively massaged (much like ejaculate). Many think cow lactation is healthy when drank for life, but really causes obesety and foul smelling odors. This is the most horrific way to describe milk.

What's even worse than the image cow lactation brings to one's mind is the image of thousands of different cow's lactation mixing and rubbing together in a "milk supply" truck.. FUCKING SICK.

Heather: Do we have any cow lactation to put into Gabi's cereal?

Brittany: *Vomits wildly all over Heather's freshly Pine Sol'd floor*

Cow Lactation by Britt k May 1, 2008