No, it is more of a euphemism for "sobering up." Existed for quite awhile, usually used for drunks though. Has minor connotations of being an oddball health nut

No, it is more of a euphemism for "sobering up." Existed for quite awhile, usually used for drunks though. Has minor connotations of being an oddball health nut-people extolling the benefits of being immersed into chilly water.