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Originated on Call of duty mw2 referring to the heart beat sensor but has moved to black ops as well referring to Motion sensors. It is a phrase meant to demean the person using the motion sensor
What a punk cant win without camping with a baby monitor!

That fool has no skill all he can do to win is use a stupid baby monitor and camp by it.
by DayLeeOwn April 14, 2011
A term used in Modern Warfare 2 to trash a player using a heartbeat monitor.
That fucking kid with the cheap ass baby monitor killed me again!
by MrConflict July 21, 2010