。。。what=wot。。。
。。。you=u。。。
。。。forget=4get。。。
。。。for=4。。。
。。。BTW=by the way。。。
say it as it sounds.....

What is pronounced "Woh-t"
for is pronounced the same as the number 4.... so replace "for" with "4"

"wot 4?" = "What for?"

replace the letter "S" with a "Z"

"Howz about that?"

Really you cant learn it you just pick it up as you go along  。。。。