Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Six-footer \Six"-foot`er\, n.
One who is six feet tall. [Colloq. U.S.]
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
six-footer
n 1: a person who is at least six feet tall