It is used to laugh at someone when you have acheived
something they cant. It can also be used to pronouce your
pride of something that others may not thing you should take
pride in.
Danny: I can't get my program to work.
Andy: Heh! Mine works!
Danny: Screw you!
Andy: Shove a
cat up your arse dude.
Dave: Im going to photocopy my passport and change my age.
Andy: You can't do that thats fraud.
Dave: Heh, dont care!