dabberooni
Someone who thinks they're cool just because they know one or two slang words.
Dabberooni: 'I'm the king of the school because I know what a dabberooni is.'
Dabberooni: 'You don't know what a dabberooni is, so you're not cool.'
Dabberooni: 'I'm the only one who uses that word, so I'm the best.'