Full of shit

Someone who is 'full of shit,' is someone who is completely lying. Since 'shit' is a bad word, obviously this should only be said around people with whom you have a close relationship.

Example:
-I can't believe she actually said that! She's so full of shit!
-Totally!

Effin'

The word 'effin' is an abbreviation for 'fuckin.'. Since 'fuck' is a bad word, it is often referred to as the 'f' word,and likewise, 'fuckin'' becomes 'effin.'

Example:
-What are you talking about?! That's effin' crazy!
-I know, but that's what they said!

Shit-faced

'Shit-faced' means really drunk.

Example:
-Last night we got so shit-faced!

Co-opt

To 'co-opt' a phrase or expression means that a group takes an expression used by another group and repurposes it for their own needs. For example, the insult 'bitch' has been co-opted by American feminists as a word to show pride in their strength. Meredith Brooks' song "Bitch" (1997) illustrates this.

Example:
-You say I'm a bitch like it's a bad thing.

My ass!

'My ass!' is a tag you can add to the end of a sentence to show that you don't believe what the other person just said is true. Since 'ass' is profanity, this expression should only be used in informal situations where you know the other person well.

Example:
-I'm thinking about coloring my hair. I'm starting to see too many grays.
-Can't imagine.
-Can't imagine, my ass!