In the song "got some money " 2:10 "It's 4.95, some call it 3.99, some call it a BILLION" 2+2=4. And 3.99 + 0.1= 4. And in a jingle of yours, (what's 2 + 2?) you say 2+2 is a billion. So you are some of the people that "call it a billion", kids that didn't learn math call it 3, and the people that don't joke call it 4. Coincidence or reference?
all i can say is, the word 'billion' is very cool, famous word for very high number. would recommend this word, to convey concepts of wildly high quantity. i hope that makes sense