Using your two thumbs, either in the vagina or anus to lift the person being forklifted off the ground.
Boy 1: I was with this girl last week and I managed to lift her off the ground by putting my thumbs inside her
Boy 2: You forklifted her?
Boy 1: Forklifting is a thing?
Forklifting is used to describe the pursuit of a fat chick by a desperate male. If one succeeds in bagging a tundra pig, he has been successful in forklifting. Forklifting is looked down upon so most men will try to hide their forklifting efforts.
Shane forklifted his prom date after a few mike's at the bonfire.
I found out my friend Justin has been out forklifting downtown, and he said he was at home playing halo.