When the top contents of multiple
Bubbles (before adding alcohol) is poured into a cup then mixed with any desired amount of alcohol. This is done in attempt to not waste any mixers while consuming alcohol.
At a party where more than one
Bubble is being consumed this method is most commonly found to conserve mixers.
see
Bubble .
"I have nothing to drink, can i have the cubble?"
"
Oh no! This cubble has too many different sodas in it....it'll
taste worse than our kings
cup!"