IIRC in the books they shit their pants often, if you sit in your crash couch wrong the G forces can push on your intestines causing you to shit your pants. So pucker up might be literal.
Seems like a US-centric (or rather corporate centric, German HR isn't too different from US one's, both serving the "Protect the company from employees"-role) interpretation of Trek, but I still think it's amusing
Damn it Bobby
He sells oxygen and oxygen accessories.