is the shortened form of the phrase: "my
is my bond" which was originated by inmates in U.S. prisons.
The longer phrase was shortened to "
is bond" before becoming "
," which is most commonly used. It basically means "truth." Or "to speak the truth."
"Yo, I f'd twelve bitches last night."
"
?" ("You speak the truth?")
"
." ("I speak the truth.")