Informal, euphemistic. Used as an intensifying adverb meaning "very" or "extremely".
It's freaking hot outside in July.
freakinginterjection
An exclamation of frustration, anger, or surprise; a euphemistic substitute for stronger profanity.
Freaking! I just missed the last bus.
freakingadjective
Informal, euphemistic. Used attributively to intensify or emphasize the strength of a following noun or adjective, often expressing annoyance, surprise, or emphasis.
Turn that freaking music down!
freakingnoun
Informal. Sexually suggestive dancing in which partners grind against each other; the act of engaging in such dancing.
The principal banned freaking at the school dance.
freakverb
To become or cause someone to become extremely emotional or excited, often in a negative way.
She started to freak when she realized she had lost her wallet.
To behave or cause someone to behave in a wild or irrational way.
He freaked out when he saw the surprise party his friends had organized.