A sex act. The instigator inserts five fingers into the vagina of a female. An optional (but recommended) second step involves the spreading of the fingers once inside, causing the vagina to stretch to unheard-of and painful proportions.
Ali gave her the two-stage Dragon Fist! He stuck 'em in, then spread 'em!
The act of dipping your hand in hot sauce, normally Frank's red hot and then shoving your hand into a vagina.
Make cupcakes bitch or you'll get the dragon fist.