It was stretched so tight across her bottom I do believe I saw one of them seams bust loose. And the opening got wider and wider and wider.
18 seconds sound clip from the Cool Hand Luke movie soundboard.
You can hear this line at 00:28:32 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, man, that little Lucille. She was really a big lot of little gal, wasn't she?
- Did you see how she was just about popping out of the top of that dress?
- And down below... man, that thing didn't reach no higher than...
- She's liable to catch cold running around like that.
- Stop beating it into the ground. You ain't doing nobody no good.
- Okay, new meat. You get some sleep. And save your strength because you gonna need it. Tomorrow.
[...]