Basically anything. Essentially it can be used as any noun or a verb in the past tense. Though it isn't a good idea to use it as a gerund.
Noun usage: Yo, I was chatting with Doug the other day and he picked up that falala and wants us to come over and check it out before we take off.
Verb usage: Sarah was so pissed that Jerry put his nose in her mouth, she falala'd his ass all night.
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