Employed ironically as a putdown, "Get fucked by a(n) [x]", where x is any number of absurd suggestions (the absurdity of which is meant to underscore the irony), is a staple of mine. Also the exclamation "D'oh!" I invented that.
I'm known to be a really nice guy, so I think it's fun to suddenly be combative to my friends in a comical way. "What's it to ya?" has been my go to phrase for the last year. It just flows off the tongue really well and it always catches my friends off guard. It's best for really mundane questions that don't warrant a negative response: "So what do you usually eat when you come here?" "What's it to ya?" "Can I borrow a pencil?" "What's it to ya?" "Did you just trip on the-?" "WHAT'S IT TO YA?" Gets them every time.
Off the top of my head, I catch myself saying "y'know/you know what I mean" and "it's one of those things" a lot.
I've been on a huge, "don't tell me what to do," kick. Example: Wife-"see ya babe have a good day at work!" Me-"Don't tell me what to do." Wife-""
I say "proud of you" a lot. Friend- I had to poop before I came over. Me- Proud of you, bud. Friend- I slept until noon on Tuesday. Me- Proud of you. Wife- I scooped the litter. Me- Proud of you.
Asking "Is this a bit?" anytime something ridiculous is happening. Saying "You don't know shit about dick." when someone doesn't know what they're talking about. I also say "Proud of you, bud." to anybody telling me anything. Any variation of wrecked, including ethered and negged. "Dad?" in any situation.
I really love language quirks. I love how every group and relationship has their own slang. I have a lot but the most common and specific-to-me one by far is say "kinky" after things that sound "kinky". Or if they don't at all sound kinky. It's kind of like my version of "that's what she said"
I just noticed that I've been using "super" in place of the word "so" as, like, an informal modifier, you know. Informal being the key word there, 'cause it typically only appears in sentences where it's dodgy grammatically. "I'm super not doing that." "I'm super gonna kill you." "I super hate myself." etc Which btw I super stole from 30 Rock.