Wordnet 3.0
NOUN (1)
1.
casualness in use of language;
The Collaborative International Dictionary of English v.0.48:
Slanginess \Slang"i*ness\, n.
Quality of being slangy.
[1913 Webster]
WordNet (r) 3.0 (2006):
slanginess
n 1: casualness in use of language