slangy

slangy
    adj 1: constituting or expressed in slang or given to the use of
           slang; "a slangy expression"; "slangy speech"
    

Slangy \Slang"y\, a.
   Of or pertaining to slang; of the nature of slang; disposed
   to use slang. [Written also {slangey}.]
   [1913 Webster]