1) If you wear glasses, they should be sunglasses. And don't wear them across your eyes. Either on your forehead, hung on the front of your shirt, or, as I've seen in some rare occasions, hung on the back of your shirt.
2) Wear a special shirt. Tiger face covering the whole shirt? Good. Dragon wrapping around the back? Good.
3) Put a crapload of gel in your hair. It should look permanently wet and in a position that defies the lawas of gravity.
4) Have six-pack abs. During your solves, solved one-handed for a while and show off the six-pack.
5) Have an iPod or other music device and get external speakers for it. Have music that's just bass beats. Bop to the music while you solve and declare, "This song is freaking awesome."
6) Have a girl that's dressed like someone from "Jersey Shore" and have her stand next to you snapping gum and telling everyone, "You're freaking awesome!". She should also bop to the music.
7) During the PLL, grab the girl and give her a big kiss. If you don't think your mom would feel awkward if she saw it, you're doing it wrong.
8) Once you're done with the solve, toss the cube on the ground, slap the girl on the backside, and say, "Pick that up for me babe."
I guarantee if you follow these stops, no one will accuse you of being a geek.