LOL... ROFL...TTYL... these words were invented for a reason, people are way too lazy to write Laugh Out Loud and Rollin on the floor laughing. Im to lazy to write the other one. But I totally understand all of this. You can't have a chat with me without me saying LOL. I mean My blogs NAME IS LOL CHEF!!! (LOL). So there are many of theses word and I am going to list them for you:
lol= laughing out loud 
bff= best friends forever 
cya= see ya 
kk= ok ok/ ok cool 
k= ok 
y= why 
4= for 
2= too/to 
gtg= got to go 
hbu= how bout you 
u= you 
ttyl= talk to you later 
l8tr=later 
tho=though 
cyl= call you later/ see you later 
thx=thanks 
np= no problem 
brb= be right back 
nvm= nevermind 
rofl= rolling on floor laughing 
rotfl= rolling on the floor laughing 
smh= shaking my head 
idc= I don't care 
hm= how much 
idk= I don't know 
tyvm= thank you very much 
gl= good luck.

Worst thing is... I've memorized all of them! Memorize them and U 2 can go LOLing in the streets of chat brb, l8tr gl in life.