What does OTN mean?
Most usages of "OTN" on the Internet these days are of Japanese origin and refer by sound-alike to the Japanese slang terms "ochin" (child's testicles) and (especially) "ochinchin" (child's penis). The term is especialy used in the phrase "gigantic OTN" meaning that a boy has a very large penis for a person of his age. As of mid-2015, the term OTN is popular primarily because of the song "Gigantic OTN" (look it up on YouTube).
Other definitions of OTN:
On That Note
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How to use the term OTN:
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More slang terms:
sealed with a loving kiss
Rolling On The Floor Laughing So Hard I Spilt My Coffee