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2 definitions by Simply Spiffing

 
1.
mum
1. A British form of the word 'mom'

2. Means to keep quiet (also British)
1. Did you call your mum yet?

2. Keep mum and we won't get in trouble.
by Simply Spiffing January 12, 2007
 
2.
A term used to describe the state which one enters when turning the volume up on one's iPod, rendering them oblivious to the world around them.

Basically you can't hear anything so you're in your own little bubble.

Term coined by Nicole Scribner
Jake was in his iBubble again so I grabbed his iPod and pulled out the headphones so he would listen to me.
by Simply Spiffing February 08, 2007