How to use "LAH"

Jack : Hey exam is coming !
Classmate : Normal lah !

Jack : Eh , don't bully people lah !
Classmate : ***** *** lah !

Jack : Look teacher come in liao !
Classmate : Lame lah...

Jack : The movie "Coming Soon" sibeh song ar !
Classmate : Ok ok lah..

Jack : Hey I got a blog !
Classmate : Cheh you out date liao lah !

Jack : I tell people how we use "LAH" on blog !
Classmate : Ki siao lah !

Haha.. Smile everyday =)
Make you feel better !