To knife somebody is when a mans penis gets shoved like a knife into somebody vagina.

A stabby thingy in your kitchen or in your purse NO BITCH IT IS A SHARP FUCKING BLADE THAT CAN HURST PEOPLE SO PUT THE GUNS AWAY AND MEET 2016 AND GET A KNIFE.thank you have a nice day

Lying next to each other. Just lay on your back..parralell. Oh the innocence.

a knife can come in many shapes and sizes.
usually consist of a blade made of some kind of metal or stone, with a handle at the other end.
there are fixed blade knives. (meaning that they don't fold, they need a sheath to keep from getting cut)
and folding (the blade usually folds into the blade.)
one of the most widely known is the switch blade. (just a knife that has a spring loaded blade, no big deal)
and then there are knifes that have the blade the slides out of the handle. and some that have handles that fold onto the blade.
then there are piece of crap fantasise knives, dont waste your money.
not a weapon unless used as one, a knife is a tool, that doubles as a weapon.

then there is the term, to knife.
means to stab or cut someone, but not necessarily kill them.
very similar to shanking someone. (although shanks are better at a stab, usually favored in the hammer fist or oriental knife hold.)

A sharp object used for killing people who don't do as they're told.

A sharp metal stabby stick

In the gaming community, using any melee weapon that has a blade to kill or eliminate foes.