ISTG
ISTG definition by Slang.net
This page explains what the acronym "ISTG" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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ISTG means I swear to God. It is an acronym used to emphasize a belief in or commitment to the truth of a statement.
The ISTG acronym is commonly used in response to a person who doubts something that you said. By swearing to God, you make a sacred oath that most people respect more and therefore, are more likely to believe.