skunk, double-skunk
"Some cribbage boards are marked with an "S" in place of "90" because a losing player is said to be "skunked" if, when the game ends, that player has 90 or fewer points. (In betting games, this would double the wager; for example, if playing for a quarter per game, then a player who is "skunked" typically owes two quarters)."

I see no dispute about this, except that all three card game rule books that I have say that skunk (or "lurch") occurs at the half-way mark and make no mention of double-skunk. Furthermore, I find on the internet one mention that "standard" cribbage has no skunking. Anyone know the history of when these variations took precedence and seem to have become "standard."?