This is the 90th most frequent Thai word.
แห
A Thai fishing net.
In this context, "แหม่" is part of a colloquial expression "แหม่บ้าน", referring to a term used by children in play, adapting the word into a playful manner.
เด็กๆ กำลังเล่นเกมแหม่บ้านสนุกสนานมาก
The children are enjoying playing a game where the pretend to be a family happily.
In this sentence, "แห" refers to a fishing net, which is a direct usage of the word's original meaning.
ชาวประมงใช้แหจับปลาในแม่น้ำ
The fisherman uses a net to catch fish in the river.
Here, "แห่" (a related form) is used as a verb meaning "to crowd", showing its metaphorical extension beyond its primary meaning.