jack off jizz motion - when you flip the bird at someone's words because you don't

when you flip the bird at someone's words because you don't give a damn and you're too lazy to say it straight up

'Bro just said the dumbest thing ever. Jack off jizz motion.'

'He insulted my mom. I did the jack off jizz motion.'

'She kept talking. I did the jack off jizz motion behind her back.'