Antiphrasis

ANTIPHRASIS

Noun. Pl. -ases. M18.

[Late Latin from Greek, from antiphrazein express by the opposite, formed as ANTI- + phrazein indicate, declare, tell.] 

RHETORIC. Use of words in a sense opposite to their customary meaning.

At my Dad's wedding, a friend and I (after a couple of glasses of wine) filled out an entry in the wedding guest book. Our entry went something like so: 

"The food was raw, the guests were sick, and the band was the illest! Great wedding, Dad!"

Hmm. Dad's not that familiar with hip-hop culture. Maybe he didn't realise we were just engaging in a bit of antiphrastic wordplay. I should probably give him a call before he complains to the caterers.