Poppin' a chubber
When you suck in during a fitting, then the clothing is too small and your stomach sticks out.
1: Ughh
2: What?
1: Take my advice, dont suck it in while youre getting something fitted.
2: Why?
1: Cuz youll be poppin a chubber!!
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1: Looks like the bride is poppin' a chubber...
2: Shame.