What? What did you say?

to keep one's own bottle of liquor or other alcoholic beverage at a bar

the practice of buying a full bottle of liquor or other alcoholic beverage at a bar and having the bartender keep the unfinished bottle until the purchaser's next visit

whatchamacallit, X

nothing

what number, how many (used with a counter) / (used with も) many (used with a counter)

What?, Huh?

what / that thing (used in place of words you can't remember at the moment.)

what

what is this?