to be under the influence of methamphetamine.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

tweak n., slang - Methamphetamine.
tweaker n., - someone high on methamphetamine.
tweak -ing, -ed, v., slang - 1) to be high on methamphetamine,
2) to fine tune.
3) to act as if being high on meth.
4) to pay extended amplified attention to tasks, usually of a trivial nature; especially when other tasks of a larger priority should be handled (with or without the aid of methamphetamine).

when someone or something is either absurdly terrible or absurdly amazing. can be used to describe just about anything.

(n.) methamphetamine
(v.) the act of consuming methamphetamines

To improve. To modify so it runs better, faster, and more efficiently.

to make a fine adjustment