An unusually large human, not overly obese or otherwise out of proportions, and not suffering from any apparent chromosomal deficiency/surplus. Usually used to refer to individuals that the speaker is not familiar with. It is generally used in the same manner a common name would be, when that common name is unknown. The masculine version is Gigantor, the feminine version is Giganta.
"Look at Gigantor wearing his new suit over there"
"I bet Gigantor thinks he's pretty tough, picking on that little guy"