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1.
A simple mix between "having a life" and "being a no life". When you do something with your real life friends over the internet.
I am a hardcore gamer who has real life friends and we play together over the internet, you can call me a semi life!
by MisterObvious October 08, 2011
 
2.
When you play video games with your real life friends.
G1 : I play games alot
G2 : Wow talk about no life
G1 : I only play them with my real-life friends though.
G2 : Oh, you have a semi-life then, Cod tonight?
G1 : No
by Ejobisgay October 07, 2011