Third nose

You penis that is used to smell things. I don’t know where the second one is.

*fwop* “mhh smells like good pizza”

“How could you tell?”
“I used my third nose”

third great-cousin-pibling

Grandparent's third cousin.

My third great-cousin-pibling is a good person.

The Third Wheel

In porn when there are 2 girls and a guy but one girl only participates only orally, and usually sparingly, if at all.

I was watching a video called AllAnal last night and even though it had Mischa in it, she was the third wheel and didn't do anal at all. She just gave the guy some head and sometimes licked the other girl.

third cousin-uncle

Parent's male third cousin.

My third cousin-uncle is a good person.

third cousin-niece

Third cousin's daughter.

My third cousin-niece is a good girl.

third-cousin-5X-removed

Third-cousin-five-times-removed (3C5R).

My third-cousin-5X-removed is a good person.

Third Hand Smoke

The act of sucking the smoke from someone elses cigarette and blowing it into someone else's face.

*a stranger blows smoke at your friend*

You: "Hey, I'm gonna report you for third hand smoke"