n. & v.
n. words, phrases, and uses that are regarded as very informal and are often restricted to special contexts or are peculiar to a specified profession, class, etc. (racing slang; schoolboy slang).
v. 1 tr. use abusive language to. 2 intr. use such language. slanging-match a prolonged exchange of insults.
[ 18th-c. cant: orig. unkn. ]