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.
Yes no maybe so is a game show held between two people where they ask a question to an eraser then tose the eraser into the air and see what is land on yes no maybe so