Have fun hitting your family and friends with the fine entries in Chris' dictionary. Definitely a lot of gems in there. BTW, 'pig's ear' is also Cockney rhyming slang for 'beer'. A twofer.
'Hi' works everywhere, too. May be easier to get in the habit of as it's monosyllablic (always a plus when communicating with Septics, in general).
"What's up?" is OK with friends, usually. "What's up, [their name here]?" is better. Unless Seattle is really weird. Don't use it with strangers who approach you, though, as it may taken as a sign you expect the conversation to be brief and to the point, very unfriendly. This is a funny one. Ask how Seattlites see it.
World War II era "what-sa who-za how-za where-za action, kid?", used mainly by Italian immigrants.
Contemporary "How's it hangin'?" (Not to be used with strangers, or when addressing females unless you want to either embarrass them or have them counter challenge you with a clever showstopper and embarrass YOU, depending on their basic take on life.)
Contemporary " 'sup? " -- (contraction of "what's up?") Makes you sound like a pretend-to-be-young-and-hip punk, again unless with close friends who know what you're up to. Tends not to carry the hurry-up connotation of 'what's up?', at least with white people, as it's slangy enough to seem friendly.
"Hey, it's ma' N-----!" I've used this with a __very__ few black people I know __very__ well, who know I mean the way they do when they use it. People I grew up with. Do NOT use it unless you're quite sure you may. Any little doubt means NO.
Lac lactis in primoris (milk in first).