What is a gay number three?

What is number three?

In reference to normal bodily functions, number three refers to ejaculation.

Definition

Based on the nursery rhyme numbering system for bodily functions, where number one is pee, number two is poop, it would stand to follow that number three was cum.

While generally refers to ejaculate, sperm, it has also been used to refer to having intercourse, though rare.