MB

Those who are apologizing or taking the blame for something may use MB to stand for "my bad." Saying "my bad" is the same as saying "oops, that's my fault."

"My bad" and MB are most often used by Americans, though the phrase and its abbreviation have become more popular in other English-speaking countries over time. "My bad" is often viewed as a rather flippant form of apology, so it's most often used among friends and family members.

An abbreviation that refers to the unit of measurement equal to 1,000,000 bytes; often associated with a device's storage capacity or the size of a file; one thousand megabytes makes up one GB.