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1.
An internationally recognized word for sex.
Barney: You invited me up to your apartment to play Battleship! Isn't that an internationally recognized word for sex?
by OhmyGoshitsMe! August 05, 2009
 
2.
To sit at a table with someone while you both have laptops open, opposite one another, as if you were playing battleship.
Dude A: Ugh. I can't believe your didn't pay your internet bill. I really need to check my email.

Dude B: Whatever, let's just take our laptops to Costa Coffee and play battleship.
by ATowny April 22, 2008