Definition of mulligans:
(n) :
(golf) An unpenalized chance to re-take a stroke that went awry.
(n) :
(by extension) A second chance.
(n) :
(collectible card games) An opportunity (sometimes penalized) for a player to reshuffle their cards and draw a new initial hand at the beginning of a game.
(n) :
A surname from Irish.
(n) :
Ellipsis of mulligan stew. [A stew made of whatever ingredients are handy and appropriate for stew, rather than of specific ingredients.]