LARPing basically stands for playing Life-Action-Role-Play.
It is a game usually played in the forest where you use weapons made out of foam and PVC.
In LARP you usually go back to the dark ages and you give yourself and others a role on the battle field.
That is in short what LARPing is and what it stands for.
What did you do today?
I went LARPing with my class!
Ah, so did you have fun?
Yeah loads of it!