When someone goes to second base on a girl and uses their free hand to go to third base on the same girl.
Sam, after quite some preparation and going to second base with one hand, got to work for real on Sandy by moving a hand to her third base; he was now performing a double-triple.
by Somebody Other Than Somewhere July 06, 2011
1 more definition
When two people having sex both cum, shit themself, and puke at the same time.
Me and my boyfriend had the flu and to numb the pain we decided to get drunk. Then we started shagging and it was going great until we ended in a double triple. We pretty much have to replace the bed now.
by triple temptress December 21, 2010