Frig (verb)

To have sexual intercourse; to have sex.

Origin:

Origin uncertain, but thought to have arisen as an abbreviation or euphemism for 'fuck' in the early 20th century.

Examples:

1. I heard they were frigging all night long.
2. She was caught frigging with her boyfriend in the park.
3. They were frigging in the car while they were parked.
4. I can't believe they were frigging in public!
5. The movie was so boring that they started frigging to pass the time.