ZOMFGG
its a biggggg exaggeration of zomg, omg, omfg and omfgg
which simply stands for 
"ZOH MI FREAKING GAY GOD"  
followed by a long line of !
"ZOMFGG DID YOU KNOW THAT LYKE THAT ONE DOOD WAS GOING OUT WITH THAT ONE SKANK????!?!?!111!"

"oh wow. ZOMFGG MY DOG CRAPPED ON THE FLOOOOOOOR !!!11!!!!!!!11!!"