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A loud, messy sound someone makes when they go all in and swallow a big cock like it's a foot-long hot dog
'Bro, you just galped like a guy who just ate a whole pizza and a burger at once.'
'She galped so hard, the guy thought he was getting a blowjob from a vacuum cleaner.'
'He galped so loud, the whole bar turned around to see what was going on.'