[KyleGoetz]

Many of these I think I've never actually used or heard, but I'm going to hazard a guess anyway. I'll mark the ones I actually use or have encountered before with a ＊

つーか　＞　と言うか＊
つーの　＞　と言うの
つって　＞　と言って
なんつって　＞　なんと言って
なんちゃって　＞　？？
てか　＞　？？
ったら　＞　I don't know what this is a contraction for, but isn't it used after a name to express exasperation?
らんない　＞　ららない？
っしょ　＞　と一緒
ったく　＞　全く＊ I think this is said with frustration, too, but can't be sure..I'm imagining a girl mad at her boyfriend muttering ったく...今日あたしの誕生日わよ！
ボクんち　＞　僕のうち＊
田中んち　＞　田中のうち＊
やっぱ　＞　やっぱり／やはり＊
っとけ　＞　っておけ（る）？
っとこ　＞　either something with 男 or ところ?
もん　＞　もの＊
ちゃう　＞　てしまう＊＊＊＊
ちゃった　＞　てしまった＊＊＊＊ (I use these last two all the time. They're probably the only to in my active vocabulary.)

Edit I just looked at Cola's answers. I think I'm going to have to agree that っしょ = でしょう. I'm guessing this based on っす being a contraction for です, which I used all the time in Japan. It became my Japanese equivalent of "like" in English. Way overused thanks to all the college kids I was around.