[have] (got|) it going on

to have a sexually attractive appearance

It originated in African American Vernacular English in the mid-20th century and was used to describe someone who had charisma, confidence, and a certain charm or appeal. It is often used informally in casual conversations, particularly in discussions about someone's physical appearance or personal qualities. It is important to note that this idiom is informal and may not be appropriate in formal or professional settings.

By next month, she'll have got it going on even more, enhancing her natural beauty and radiating confidence.
She has it going on with her stylish attire and confident demeanor.
She is currently having it going on, turning heads wherever she goes with her stunning looks and poise.

to achieve or experience significant success or progress, often with a sense of confidence and positive momentum

The origin of the idiom "have it going on" is believed to have originated in the United States during the latter half of the 20th century. It is used to describe a person or situation that is experiencing significant success, progress, or accomplishment in a particular area. It suggests that the person or situation is doing well and has everything they need to continue succeeding.

He had got it going on during his time in college, excelling academically and being actively involved in campus activities.
Last year, they had it going on when they won multiple awards for their innovative product.
She has it going on in her career, receiving promotions and recognition.