A drug abusing loony
That person is an eeefreak.
Tetchy (tech-ey): adjective
Easily irritated or annoyed.
Synonyms: cranky, fractious, irritable, nettlesome, peevish, peckish, pettish, petulant, testy, techy.
"As a critic gets older, he or she usually grows more tetchy and limited in responses."
"z0myg0sh, the dude at that place where we did that with those people was really tetchy!"
"Not the least tetchy of his countrymen."