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I found these two recently in different sources:
Она уже не маленькая, если что.
(talking about their daughter, who wanted to move to America)
Я пойду и побью его. - Он 5 лет занимался боксом, если что.
The only reference I found for если что was with случится, i.e. if anything happens. What is the speaker trying to say in these examples?
The first can be translated as:
She is not a kid, just in case you forgot.
or depending of a context:
She is not a kid, (she will manage to solve the problems) if anything happens.
The second is:
He has 5 year boxing experience, just in case you did not know.
Or maybe "if you know what I mean" will better translate "если что" here.
The usage is slightly non-standard, but understandable.
It's a turn of speech combining the meanings of "if something (unclear, misunderstood, happens, goes wrong, etc)". Russians love to use such unspecific phrases with different meanings. See also: Ну ты заходи, если что
