だちともMeanings1nounfriend; buddyslangSlang term derived from reversing the syllables of 友達 (ともだち). Used in casual, often youthful speech.See also: 友達 (ともだち)あいつは俺おれの一いち番ばんのだちともだ。That guy is my best buddy.だちともと遊あそびに行いく約やく束そくをした。I made plans to hang out with my friend.