The word "bby" is an abbreviation of the word "baby." It is often used as a term of endearment or affection for someone, similar to calling them "sweetheart" or "darling." Full definition
We have already seen consumer weakness on Home Depot's HD, +1.13 % and Lowes LOW, +1.02 % negative same - store sales, and lowered guidance by Best Buy BBY, -0.67 % — the bell cows of consumer discretionary spending. (marketwatch.com)
Like everyone else, I get bby in all these places with no more than manageable discomfort. (mommyniri.com)