On a hot day:
It's a scorcher, bro!
When walking down the sidewalk:
Don't step on a crack or you'll break your mother's back. Word!
If someone successfully scares you, when you are known for being cool as a cucumber:
Wow, you scared the dickens out of me! Mad props, homeslice.
When you hear some surprising, but terrible news, like your llama escaped and broke into a furniture store and started making love to the chaise lounges:
Oh my lans! That is whack!
OR
When you hear some surprising, but good news, like your llama escaped and broke into a furniture store and somehow smuggled home a chaise lounge for you:
Oh my lans! That is so dope! Thanks, Hank! (Hank is the name of my llama, of course).
...and many, many more.