stiffy

noun4

1. •
   (slang, vulgar) An erection of the penis.

   • Fred's got a bulge in his pants — you can tell that he's got a stiffy.
2. •
   (slang) An extended magazine of a gun.

   • Oh you know I like to mac When they don’t talk back I'll be there in a jiffy with a stiffy — 2014
3. •
   (South-Africa, informal) A computer floppy disk of the kind supplied in a stiff plastic outer shell.

   • Never leave home without a spare stiffy disc in your bag.
4. •
   (informal, disapproving) A rigidly conformative person; a square or goody-goody.