i'm really envy you why don't we follow each other and i don't understand 손발함당's meaning even i'm native korean speaker...:)

부러워융 우리 맞팔해요 손발함당 i'm really envy you why don't we follow each other. I will follow you first. Here 손발 is a twisted form of 선팔 선팔 means "follow first" 선팔함당 is a twisted form of 선팔합니다 It means "I will follow you first" You can answer "Thank you. 고마워요"

I am not sure about the meaning of 손발함당, but if she works in a nail shop, I guess 손발함당 is a kind of slang which means 손발한다(손과 발을 관리한다). Maybe she does manicure and pedicure.