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с приветом stresses
amer.	sicko (Taras)
Gruzovik, inf.	yours sincerely (formula at the end of a letter)
idiom.	batcrap crazy (yulia_mikh)
inf.	off one's trolley; kinky (alex); nutty (We never thought anything bad about the guy. He was just kind of nutty. ART Vancouver); coo-coo for Cocoa Puffs (о человеке с отклонениями в психике Rust71); up the creek (В.И.Макаров); not all there; with compliments (в конце письма); with kind regards (в письмах); daft in the head; wrong in the head; be up the creek; flaky; pixilated; balmy in the crumpet; barmy in the crumpet; barmy on the crumpet; balmy on the crumpet; crank; dotty; wacko (Aprilen); kooky (о человеке Val_Ships); cranky; gaga; several cards short of a full deck (Taras); off-the-wall (an unpredictable, off-the-wall personality dictionary.com Shabe)
invect.	bugfuck (DC)
slang	off one's rocker; off one's chump (Anglophile); buck wild (Taras); a couple of chips short of an order (Anglophile); one stop short of East Ham (Anglophile); two wafers short of a communion (Anglophile); one sandwich short of a picnic (Anglophile); one brick short of a load (Anglophile); a few snags short of a barbie (Anglophile); a few bob short of the pound (Anglophile); have wheels in one's head; odd-ball; out in the left field; out to lunch; queer as a three-dollar bill (phony); queer-beer; flakey; whack; fruit; mishoogeh; mishugah; oddball; wack; twink
slang, Makarov.	bent
Игорь Миг, inf.	touched; nut job; whack job; wack-a-doodle; cuckoo pants; crazy pants; one card short of a full deck; one brick shy of a full load; a little off emotionally; a little off psychologically; freak

с приветом: 29 phrases in 7 subjects

American usage, not spelling	3
Business	3
General	13
Idiomatic	1
Informal	7
Librarianship	1
Social media	1