I recently played a word "TIK"--which is shown in Collins dictionary as South African slang for crystal meths. However it is not allowed on official scrabble website. Why not?
perhaps it's not regarded as English. It's a word in Lithuanian and Tatar and various other languages as well. It's also a word in Dutch, so it's made its way into Indonesian and Afrikaans - which seems to be the origin of the slang you quote.
It's in the Oxford English Dictionary and for the etymology, it states, "Origin uncertain. Perhaps imitative of the distinctive popping sound made when the drug in crystal form is lit and smoked (compare the alternative name tuk tuk in quot. 2004)."
As stated above: no two dictionaries are the same, so you'll get different results depending.
It appears only to be in Collins, of the respectable dictionaries, so maybe it hasn't filtered through to a scrabble dictionary yet. Scrabble dictionaries will always be behind the curve a little, you'd think.