The more time you spend interacting with English speakers, the better your slang will become.
These shortened versions of normal words may develop out of practicality alone.
SMH is often used on social networks where people talk to each other or comment on posts, as well as in text messages.
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Have you been a UX design director or higher at a company with more than three or four designers? TBH, girls who order a salad and eat their partner's fries really get on my nerves 3: TMI Too Much Information, because sometimes, some things are best left unsaid.
Would you be willing to chat on the phone for 30 minutes? The abbreviation, however, is now widely familiar in internet culture—and common enough that some people will say SMH in their speech as they might LOL or OMG.