Top definition
When something truly disasterous happens.
Boy: Wanna get freaky?
Girl: For sure, have you got protection
Boy:No, But its all good
Girl:I dont think so...
Boy: Ratsbum!

"That chicks got a really nice body but a ratsbum face".

Getting final Killcam'd on COD... Ratsbum

Finding out your wife is cheating on you is very Ratsbum.

"I see you stood in dog shit...Ratsbum"

Stepping in a big puddle is Ratsbum.

"Entries may be edited and become the property of Urban Dictionary"....Ratsbum!(small print at the bottom of page!)

Opposite of Un-Ratsbum (see Un-Ratsbum)
by Instantanious Man May 24, 2011
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