Wiktionary
slangily
adv. In a slangy way.
WordNet
slangily
adv. with slang; in a slangy manner; "he expresses himself slangily"
Usage examples of "slangily".
And as Bill slangily put it, they were using their pile to cut a lot of social ice.
Mollie slangily, as she and Betty disappeared into the adjoining room.
And whatever language they spoke, they spoke it idiomatically, even slangily, with none of the stiffness and awkwardness with which human beings speak a new language which they have recently acquired.
Frank, slangily, while he regarded the pair thus designated with profound admiration.