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1.
"Sea ottering" is to cuddle and fall asleep with a partner.

This is because sea otters often rest together in 'rafts' and hold paws so that they don't float away from their group, as seen in the popular YouTube video "Otters holding hands" by user cynthiaholmes.
Girl: Sea otters are so cute. Did you know they hold paws when they sleep to keep from floating away from eachother?

Boy: Haha no I never knew that, that's actually pretty cute.

Girl: Isn't it!

Boy: Yeah, and hey, maybe we can 'sea otter' sometime, yeah?

Girl: Okay! I look forward to sea ottering with you. *wink
by JakeyJ November 07, 2010
 
2.
sex or and sexual act
they were sea ottering all night
by xavier johnson February 15, 2006