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The level of how intoxicated (increasing or decreasing) one person is through a night. (usually following a certain number of actual buttons deep) As the person (male or female) becomes more intoxicated and comfortable, more shirt buttons are undone. Either to show cleavage or chest hair, the drinking person might think makes them look more appealing. Good for use in present or past tense.
"Look at E over there...she's 3 buttons deep!"
"Ya she's felling the effects of the booze."

"Man you were trashed last night!"
"Yeah I know, I was 5 buttons deep."
by AwesomeAl September 24, 2007
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