To acquire something immediately but pay for it later. Most often used when buying drugs but quite valid for any kind of purchase.

There are thee possible origins of the term:

* The vendor keeps a list of who owes what, and "ticks" them off the list on payment
* The vendor has to wait, the clock is ticking
* The customer is a filthy parasite, like a tick on a dogs back.

as opposed to the typical pronunciation "thickness" which refers to a thick, desirable, voluptuous woman (usually with a large behind and fine curves), this word is pronounced tick-ness, so as to adhere more to the gangster accent/origin from which the term is derived

to give someone drugs now, knowing that payment will happen some time in the near future

The best freakin' cartoon ever to air. It featured a blue hero name "The Tick" who was strong, big, and innocent. Engraved in stone is his battlecry...SPOOOOOOOON!

To give someone 'tick' or 'ticka' is to give someone drugs on credit.

small bugs that get stuck on your skin

Tick: A pest. A problematic insect. Also refered to as a BoRe. The tick/BoRe easily gets under your skin causing irritation. The Tick/BoRe seems to be found in most parts of the world. It is an annoyance to nearly every known creature. It's only known natural enemy is 2 species found within the UK. They are commonly refered to as the "Lion1" and "Lion2". The tick/BoRe immediatly runs/retreats at the sight of these creatures. The only known cure for the tick/BoRe is the use of the "ignore" feature.