In Tabletop or Board Games involving armies, tableing or to table someone is to completely and utter wipe out an opponent's unit from the board, often in an aggressive manner.
Sometimes, not always, tableing someone requires that the army had been built specifically to destroy another person's army, or to ignore strategics assets in order to bring more firepower, so tableing someone on purpose can be considered rude, especially by the loser.
Player 1: "Ok, I move my flamethrower units closer to your last squad and fire. *rolls* That's 8 hits."
Player 2: "Rolling to save. *rolls* Nothing. You wiped out the whole squad. Damn it, I've been tabled!"
PLayer 1/Observer: "Maybe you should try different units to avoid tableing"
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