Douglas Harper's Etymology Dictionary
choad
also chode, "penis," c.1968, U.S. teen slang, of unknown origin. Guesses include supposed Navajo chodis "penis" ["Cassell's Dictionary of Slang" 2005], or a supposed Hindi, Bengali or Gujarati vernacular word for "copulate" ["New Hacker's Dictionary," 1996].
Wiktionary
choad
n. 1 (context vulgar slang English) A penis, especially one that is short and thick. 2 (context vulgar derogatory slang English) A loser or undesirable person; an insulting name. 3 (context slang vulgar English) The perineum.