My wife told me when someone types a message in all caps...

THEY'RE YELLING, or talking very loud.

also, definitions

"Flea Allergy Dermatitis" or "Flea Bite Hypersensitivity" is the most common dermatological disease of domestic dogs in the USA. When fleas feed, they inject saliva that contains enzymes and histamine-like substances, which cause irritation and pruritis (itching). Repeated exposure to these substances can cause an animal to become hypersensitive.

"it was all the rage that season"

and

ETYMOLOGY:
Possibly from fidfad, fussy person, fussy, from fiddle-faddle