I've got this thing that's started to bug me for the past hour as I'm trying to remember the name of a very awesome 'someone' that I read about in the Old Testament, and I'd like to read it again.

The story sorta' goes like this. One day God decides to disguise himself as an ordinary person and comes knocking at this guy's door. And as soon as the man opens the door God jumps on him and starts throwing fists in his face for no reason ... then the guy, not knowing that's God who punched him, fights back and they both commence in kicking the living **** out of each other ... and this goes on for like ... days in a row, if I remember correctly.

At the end, they're both exhausted but neither looks like they want to give in, when suddenly God reveals himself to the man and he's all like 'Congratulations, my son, you have passed my test of endurance' or something like that and the guy goes 'Oh, ****, it's GOD! What the hell man, couldn't you just challenge me at an arm wrestling match, I mean Jesus Christ!' (well obviously that's not what he said, otherwise God would have smacked him in the face for taking his son's name into vain).

And then God says farewell and leaves the end.

Well, anybody know what's the dude's name and what chapter/verse did this happen in? (As a place to start I know it's not the story about Jacob and that Angel Esau, though they sound similar)

This is the ONLY passage in the Bible that you can be talking about. There is nothing else even remotely close.

Genesis 32:

Jacob Wrestles With God

24 So Jacob was left alone, and a man wrestled with him till daybreak. 25 When the man saw that he could not overpower him, he touched the socket of Jacob's hip so that his hip was wrenched as he wrestled with the man. 26 Then the man said, "Let me go, for it is daybreak."
But Jacob replied, "I will not let you go unless you bless me."
27 The man asked him, "What is your name?"
"Jacob," he answered.

28 Then the man said, "Your name will no longer be Jacob, but Israel, [e] because you have struggled with God and with men and have overcome."

29 Jacob said, "Please tell me your name."
But he replied, "Why do you ask my name?" Then he blessed him there.

30 So Jacob called the place Peniel, [f] saying, "It is because I saw God face to face, and yet my life was spared."

the OT is hilariously awesome