A definitive interpretation Taking all factors into account, the most reliable, general reading is: “They are coming G” is a deliberately flexible utterance that primarily functions as an attention-getting signal of imminent arrival, with tone and intent set by social context. The bare sentence communicates immediacy; the appended “G” frames the relationship between speaker and addressee—familiar, informal, and potentially performative. Its viral utility stems from that flexibility: it’s a minimal scaffold that communities fill according to need (warning, hype, joke, or threat).
Either way—you’d better get ready.