Not Gonna Lie
Indicating you are admitting something that may be considered strange
Could be deemed the equivalent of 'just saying' or 'no offence' in the sense that it makes your statement more valid/less offensive

not gonna lie. A pre-sentence or post-sentence addition that assures the recipient that you are indeed not lying.

Not Gonna Lie.

Term used like "im not even kidding" and "no joke"

it mean “not gonna lie” lmao for all u idiots

NGL is an abbreviation for “not gonna lie.” It's usually used at the beginning of a sentence to indicate honesty or vulnerability. ... It could be used to insult someone, to share your honest opinion, or to open up your emotions. In most situations, NGL is simply used to share your opinion.

textspeak for "not gonna lie"