To have the qualities of a stimulant, such as meth. This can include feelings of jitters, excess energy, paranoia, restlessness, etc. See twack.
1. I drank too much coffee and now I feel all twacky.
2. Sue did some twacky ecstasy and stayed up all night.
3. That guy is so twacky that he must do a lot of speed.
awww that gum has left a twacky taste in my mouth,
that's so twacky I wont be doing that again,
I shouldn't have burnt the candles at both ends last night wrecking it up I have got severe morning after twacky mouth gross!