fibilous

very annoying, weird

you are acting like a fibilous dick

Fibilance

Fibilants are fricative consonants of medium to low amplitude and pitch, made by directing a stream of air passing through the teeth

It's is a language device, similar to sibilance, however it connotes a different meaning in a different way. Sibilance mostly focuses on the sound itself produced, whereas fibilance mostly focuses on the facial movements from the readers to convey emotion

Person 1 - "This author uses many 'f's' in this sentence, what could the language device be?"
Person 2 - "It's fibilance"

Fibilance

A literary device and figure of speech in which a fictive sound is created in a group of words through the repeated ‘f’ sounds.

An example of fibilance is “The flowing flakes that flock” Wilfred Owen- Exposure.