Top Definition
Just before a dog cums the centre of it's penile shaft expands out. So the cum doesn't leak out.
Women into bestiality take great pride in being able to take the knot.
by tarzan August 02, 2003

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
When animals mate, specifically canines--I'm actually not sure about felines--the penis enlarges during climax and remains enlarged to the point where he is literally stuck inside the female for as long as it the mating process goes on.

This happens to ensure insemination, and the male can ejaculate several times before he is shrinks down small enough to unmount. This is used as a kink of sorts in hybrid / abo fanfictions.
"Does this fic have knotting in it?"

"Is it a knot fic?"
by capurseus January 27, 2017

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug