Straddle
A voluntary blind, usually twice the big blind, posted in the dark before the deal. Buys the last preflop action.
At a $1/$2 table, the player under the gun pushes out $4 before looking at a card - the straddle. Now there are three forced bets, $1, $2, and $4, and preflop action opens on the player to the straddler's left instead of under the gun. Say it folds to the cutoff, who raises to $20 with ace-king. The button calls with pocket nines, both blinds fold, and the decision lands back on the straddler, who peeks at two queens for the first time. Call the extra $16, or raise. That is the big blind's spot, shifted one seat and blown up in size, with the whole table's action already showing.
→ Action opens on the next seat; the straddler speaks last preflop.
The last word is the point. The straddler watches everyone else act before adding a chip, and the extra blind swells the pot before a card is dealt. Bigger starting pots drag the table into bigger, earlier confrontations than the stakes alone would. Good players use that last look to dump hands that flop badly in a bloated pot, and to lean on the field once it shows weakness.
Beginners treat the straddle like a seat upgrade they can buy every orbit, betting that the extra look pays for itself. It rarely does. You have posted two big blinds in the dark, and that money has to come back before the view turns any kind of profit.