Tall Jeremy is the translated name that Roger, in his persona of Gust Breezer, Wind Theorist, gives to a Sumerian giant he assets is causing windy conditions in "A New Era For The Smith House".
He convinces the CIA to loan him the company yacht, and takes the Smith's along on what they believe is a replacement vacation for a crappy one they had just completed. However, Roger trades the yacht to Somali pirates for a poorly equipped rowboat in an effort to actually find the giant. After a month, the family gets fed up and calls for a CIA rescue copter, but Roger stays behind to keep looking for the giant. He awakens one morning to find he's being held by "Tall Jeremy", who reveals that the winds are being caused due to being sick. Unable to eat hot soup and unwilling to eat it cold, Roger agrees with him to just go back to eating people and has him toss him back toward home.