True that

Another slang way of exclaiming "I'm with you on that!" or "Hell(s) yeah!";

the preppy definition of "I concur with your last statement."

Also the East Coast version of the common West Coast exclamation "Right on!"

Malibu Matt: "We should hit those monster swells, bro."
San Diego Sam: "Right on."

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Jersey Jim: "I'm'na hit that monster til my hand swells, yo."
Miami Mario: "True that."