"Frickin'" is a slang word that means "very" or "extremely".

This word actually replaces a curse word:

It's fucking freezing out there!

But the word "fucking" is extremely unacceptable in a lot of situations. Children aren't supposed to say it, and it's considered very rude to say it to someone who's older or younger than you, someone who you don't know well, etc. So English speakers sometimes use words that sound similar to "fucking":

It's freaking cold out there!

It's friggin' freezing!

These words are still not considered polite English, but they don't sound as harsh and dirty as "fucking". They only replace it when it's used to mean "very".