adj. Of, pertaining to, or having shapely buttocks.
/ˌkæləˈpɪdʒiən/

Callipygæ and women largely composed behinde.
Pseudodoxia epidemica, Sir Thomas Brown (1646)

Because a shapely posterior deserves a word just as bootylicious.

While bar hopping with friends, do you worry about talking about a woman’s physical features without her hearing? Fear no more. “Bro, Check out that callipygian female!” Or you could use it as a noun… because I say you can. “Don’t look now. Callipygian: 9 o’clock!”

Ladies: Baby got back? Does your callipygous behind bring all the boys to the yard? If you ever hear “Damn girl! You is callipygian!” You know the man has a very large… vocabulary.

adj. Producing cold.

Data for determining the frigorific effect of the ice on the temperature of the Pole.
An account of the artic regions, William Scoresby (1820)

It’s summer right now but when winter comes again it’ll be friggin’ frigorific! “Frig” as in “frigid” means, of course, cold.  And “-rific” is uninterestingly enough a respelling of the French word “frigorifique.”

For the purpose of my own satisfaction let’s say that it’s from “terrific,” so that Frigorific now means “terrifically cold.” People make up words all the time, who says I can’t change definitions or etymologies?

The original meaning was used in science but, as always, figurative use is much more fun.

A frigorific torpidity of despair chilled every sense.
Zastrozzi, Percy Bysshe Shelley (1810)

He sure had a way with words! And now you can too.

“Mom! This meatloaf is frigorific!” … “Silence, you old frigorific hag!” … “The frigorific weather and bigger rigor made him wiggle and wriggle like Tigger and he lost his vigor.” Say that one five times fast.

Verb. To annoy, irrititate.

There’s nothing niggles me more than cutting myself shaving.
- A Kind of Loving, Stan Barstow (1960)

The word has had many different meanings over the years but ‘to annoy’ is the most recent and the one I like best.

It’s almost too cute not to use, isn’t it? It has a savory sound to it. If it bugs you – it gets under your skin or pinches. If it pisses you off – it makes you angy. If it perturbs you – you’re vocabulary is above average. If it niggles you… what is it exactly?

I would probably use it to describe the little annoyances in life. As in the above example, to cut one’s self shaving; to misplace keys; to oversleep just enough to make you rush though the morning routine…

I get very niggled when pop-up ads flood my screen. What niggles you?