Originally Posted by
ClearPath64 
Pretty sure lg is referring to a fist pound, which is akin to a high five, back in our day. Not to be mistaken with a bro hug. You know, the way guys show affection and still retain their man card. I might have just exceeded my quota of weird American guy terms.
Or, a Southern fave - "tell someone to go pound sand" - basically, to F-off in that uniquely *polite* yet often code worded Southern-ese.