The Collaborative International Dictionary of English v.0.48:
Slangy \Slang"y\, a. Of or pertaining to slang; of the nature of slang; disposed to use slang. [Written also slangey.] [1913 Webster]WordNet (r) 3.0 (2006):
slangy adj 1: constituting or expressed in slang or given to the use of slang; "a slangy expression"; "slangy speech"