eskimo balls deep

When it's so cold out that you tuck your scrotum into the woman's vagina during sex to keep it warm.

"It was so freezing last night I was pounding my old lady and had to go Eskimo balls deep to stay warm!"

Floss the cat

1. Verb; To have sexual intercourse. 2. Verb; to masturbate, typically by someone who has a vagina. 3. Verb, colloquial; to participate in a repetitive or mundane activity, used as a substitute for any of the myriad synonyms for masturbating, typically associated with vaginally self-stimulating.

"What are you doing this weekend?"
"I gotta floss the cat."