GTG is an acronym used to signify the end of a conversation or a meeting. However, there are several synonyms that can denote the same meaning as GTG. Some of the common synonyms include BBL, BRB, CYA, TTYL, etc. BBL stands for "be back later," while BRB means "be right back." CYA is an abbreviation of "see you," and TTYL is an acronym for "talk to you later." These synonyms are used to convey a similar message as GTG, which is that the speaker is leaving or that the conversation is coming to a close. Regardless of the synonym used, it's crucial to ensure proper communication with the other party when concluding a conversation.