A modified down tube for a water pipe that instead of just having one large hole opening into the water, instead the glass comes to a closed tip, along which are several smaller holes. This supposedly cools the smoke before being inhaled by diffusing (spreading) the smoke over a larger area.

The movement of molecules from an area of high concentration to an area of low concentration.

If something is diffuse, it is very spread out or scattered.

the movement of molecules and ions from a high concentration area to a lower concentration area down the concentration gradient as a result of their random movement

Moving Venmo balance from one account to another back and forth until all of you have the same balance and no one wants to put their card down anymore.

A piece of automotive bodywork that is meant to deliver downforce by channeling air under the car, especially under the midsection and rear, so that it creates a low-pressure system under the car which sucks the vehicle to the ground. This increases traction and stability at high speeds.

These are especially prevalent on high-performance sports cars, supercars and most racing cars when putting spoilers that create similar downforce would just cause too much drag.

An emo-punk band. Most of their songs revolve around being hated by everyone. They sound like Linkin Park but with a twist of emo in it. I don't see how that's punk, honestly. Punk's about rising up against the system, doing what you feel like doing and not crying about your ex-girlfriend or being pushed around by everyone.

See Simple Plan.

The female part of a bong's downstem that you put the actual bowlpiece into that specifically has around 10-15 small holes blown near the end of the tube that goes into the water.

Contrary to what the dipshit who posted the first definition thought, these holes are not drilled or cut with a laser. I don't know where he got his information, but i have made many diffused downstems in my day, and i certainly do not own a laser or a glass drill bit. I own a torch, and the holes ARE BLOWN LIKE ALL OTHER FORMS OF GLASSWARE INTENDED FOR SMOKING PURPOSES!!!! What a shocker, huh? That glass blowing would involve blowing. The science behind it is that you crank up the oxygen in a oxygen/propane torch so that the flame becomes concentrated, and ultra-hot. Then you heat up a small area that you want one of the holes to cover, and then blow into the tube until the area bubbles up, then pops like gum. You repeat this until there are a sufficient number of holes for there to be little to no drag when hitting the bong that the downstem is intended for. Used properly, this form of downstem enables the smoker to take bigger hits as the smoke is cooled and filtered more efficiently.

The only time a laser is used is for slitted diffusion openings, not holes. This is only found in very upscale bongs like ROORs.

The spreading of a cultural trait (eg, material object, idea,or behavior pattern) from one society to another