When you have marijuana in your possession and a friend who has no money to throw down on it and is asking to smoke for free and says "burn me up".
by passthetreesplease420 March 14, 2011
an acronym for the phrase "betweeen me & u" -- let's another person to know to keep what is being said a secret
"bmu...I think he's kinda hot, even though he has really yellow teeth."
by tt2563 August 12, 2008