The art of putting a cupped hand into the trousers for oderiferous transfer of flatulence to an unsuspecting bed mate.
Damn it Vance! Did you have to hand fart me during my beauty slumber!!!!
A farting sound produced by clasping both hands together so that air is trapped between the palms, then squeezing so that the air must escape by vibrating the skin of the palms. This can also be produced by pulling air back into one's hands after the air has been squeezed out. Some people are so 'talented' at this that they can play rather complex music with it. One who is skilled at producing hand farts is called a 'manualist'.
Whoa! That guy just played the Star Wars imperial march with hand farts!
The act of one wiping own arse with bare hand, then wiping said hand across a victim's face.
"ahh, dude.. You got a streak on my face from that hand fart!"
"I just hand farted Dan and he puked all over himself."
"Dude, your face smells like hand fart."