gigachad · noun1
From giga- + Chad (“a very attractive man”). Although isolated uses exist earlier, the term was popularized by an anonymous poster on the 4chan /pol/ board on October 17th, 2017, who referred to Russian model Ernest Khalimov as "Gigachad". See Gigachad for more.
Gigachad · proper noun, noun2
From giga- + Chad. Coined by an anonymous poster on the 4chan /pol/ board on October 17th, 2017, who described Russian model Ernest Khalimov as a "gigachad" who was "the perfect human specimen destined to lead us against the reptilians" (see quotation below).
Etymology from Wiktionary, CC BY-SA 4.0.