manipulating recorded sound via its speed (forwards, backwards, fast, slow, etc.) and volume (smooth fading or choppy). Usually done over a beat to express rhythm and skill. Can also be applied to drum (to make drum beats from skratching), basslines, words, synth noises et al.
Shlarching is a verb that comes from an act most commonly used during SCAT sex, when seminal fluid or cum is sucked from the female participants vagina, in a pig like eating fashion after the act of borud.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.