From slang + -y.
slangy (comparative slangier, superlative slangiest)
- Including or given to slang.
- Synonym: (archaic) slangular
- Antonym: nonslangy
His slangy speech was almost uncomprehensible to anyone over the age of 18.
- (dated) Flashy; vulgar; loud in dress, manner, and conversation.
- (flashy, vulgar): 1873, John Camden Hotten, The Slang Dictionary