When a shirt is tight from the waist to below the boobs then flairs out to tighten at the neck creating a loose pouch that contains the boobs.
"I wonder how big her boobs are inside that pouch"

"I keep my boobs in a pouch where they are less likely to be seen"

"My boob pouch really holds in all my boobs"
by TheVillage October 12, 2009
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