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1.
To have sex with a one night stand in the morning as well as the night before.
"Dude I did a double shift last night cos she was an awesome fuck"

"Hey thats my mum you're talking about dickhead"
by Ste Crayston November 02, 2006
 
2.
During a threesome, when you receive a blowjob and rimjob (getting your rectum licked) at the same time.

The term "double shift" is derived from work shifts; as you receive two jobs, you are working a double shift.

Can also be used in past tense and as a verb; I got double shifted last night. Or I love double shifting you.
Mike: Hey V, what happened with you and those two girls yesterday, Genoush and Vartuhi?

V: Bro, everything was going good, I was making tolma with them in the kitchen then they randomly took off my pants. Genoush sucked my dick and Vartuhi ate my asshole. It was weird man.

Mike: Oh, your so lucky, you just got a double shifted.
by Stairway2hell June 14, 2014