What is what does asab mean in text?

"Asab" is internet slang that stands for "as a [gendered term for a jerk]". The blank is usually filled with either "boy" or "girl," creating "as a boy" or "as a girl."

• It is used to preface an opinion or observation, typically one that reinforces a negative stereotype about the speaker's gender. It is a self-deprecating way to introduce potentially sexist or stereotypical statements. For example, "As a boy, I hate shopping."

• The phrase is often used ironically or sarcastically. It can be a way to highlight the absurdity of gender stereotypes by seemingly reinforcing them.

• Its use can be controversial, as some find it to perpetuate harmful stereotypes, even when used satirically.

Here are some links about the keywords in this answer.

• Slang
• Stereotype
• Irony
• Sarcasm