"I've been 6'4'' since I was 12. Goofy is somewhere in the lexicon"

This quote by Jason Segel is likely referring to his tall stature and how he has been tall given that he was a young age. He is most likely comparing himself to the Disney character Goofy, who is likewise high. By saying Goofy is someplace in the lexicon, he is most likely describing the reality that Goofy is a widely known character and is typically used as a contrast to high people. This quote is most likely indicated to be humorous, as Segel is making a joke about his height and comparing himself to an animation character. It is likewise likely implied to be self-deprecating, as Segel is minimizing his high stature. In general, this quote is most likely suggested to be funny and self-deprecating, as Segel is making a joke about his height and comparing himself to an animation character.