A meaningless but more exciting variation on the "yes/no?" question. Popularized by Gan Xingba's Avatar: the Abridged Series.
Can be abridged as "y/n/m/l?", but chances are, if your friend is not a hardcore Avatard, s/he will have no idea what the fuck that you're talking about and get confused.
Should we go see the movie? Yes/no/maybe/lobster?