GAT Meaning of GAT in English [gat] archaic past of get [2]gat n [prob. fr. D, lit., hole; akin to OE geat gate] (1723): a natural or artificial channel or passage [3]gat n [short for Gatling gun] (1904) slang: handgun Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012