Top definition
When a guy is having sex with his girl and uses her back as a table to play his video games on. This can include using her back as a place to rest a laptop or a controller.
Dude, I totally Ursa Majored my girl last night while playing World of Warcraft on my laptop!

see also: ursa minor
by OhUrsa March 24, 2009
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The vengeful act of crapping on a lover's chest while they sleep.

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