"Yo, at the party the other night, I walked in on Mary getting double dipped by Tom and Harry!"

from Seinfeld:
"Did you just double-dip that chip?"
"Excuse me?"
"You double-dipped the chip."
"Double-dipped? What are you talking about?"
"You dipped the chip, you took a bite, and you dipped again."
"So?"
"That's like putting your whole mouth right in the dip. Look, from now on when you take a chip, just take one dip and end it."

My boy Jamal is so double dipped he gets counted absent at night school.

Welsh dealer at Glastonbury: "look 'ere boyo, go easy with that- it's double dipped."

You're on your way back to base to buy a couple slippers of agility then all of a sudden BAM Omnislash BAM Lunar Eclipse...

You just got double dipped.

That chick is double dipped!