(1) Originally, the call of the leadsman signifying that the water is more than 6 fathoms deep, but less than seven. (2) Euphemism for throwing something overboard. Also seen as 'splash', 'float check', 'float test'.
"I had to Deep 6 (six) that loser because he was getting annoying."
by VanGoghzEar September 12, 2009
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