* It's a misspelling: There might be a similar-sounding word you're thinking of. Could you provide more context or information?
* It's a regional term: It could be a word used in a specific region or dialect. Where did you encounter this term?
* It's a slang term: Slang terms often vary depending on location, age group, and subculture. Do you have any idea where this term might be used?
Please provide more details so I can help you figure out the meaning of "tongatong"!