The term "girlalala" is used when describing someone physical appearance in an exciting or dramatic way. It can be used when someone looks especially stylish, beautiful, or stands out in a crowd.
For example, if a friend shows up in a new outfit that turns heads, you might say 'That's so girlalala!' to hype them up.
This math is so reasonable, btw. Girlmath is basically if you have a budget of $20 when you go into a store, but these beautiful pair of jeans are $25 you will only be paying $5 because you had orgianlly planned to spend $20 but it was $5 more so that 20 was aready pretended and paid $5 dollers over so you only paid $5. Get it?