ISTG is an acronym that means I swear to God. It can be used to convey extreme seriousness, exasperation, or surprise, and is usually used outside of a serious religious context.

Is it bad to say Istg?

There are other ways to make yourself sound sincere. Likewise, you probably also shouldn’t use ISTG when speaking to anyone who’s very religious or spiritual—out of respect for their beliefs. They might get offended by an expression like this.

What is OML texting?

OML is an acronym in texting that means oh my Lord, and it’s also a social-media hashtag for the Linkin Park song, “One More Light.” Related words: oh my lord.

1. an expression used in text messages or e-mails signaling happiness or laughter. XD is an emoticon. X represents closed eyes while D stands for an open mouth.