shiesty /ˈʃaɪsti/noun 2adjective 1forms 5 noun2 •(slang) A black ski mask or balaclava. •A person that is untrustworthy, selfish, deceitful and in some cases heartless. adjective1 •(US, slang) Shifty, untrustworthy, unscrupulous.The same sheisty cats that you hang with and do your thang with / Could set you up and wet you up nigga, peep the language — 1998 formsshiesties · more shiesty · shiestier · most shiesty · shiestiest