know what are talking about

know what you are talking about

to speak in an informed way because of your experience or education He doesn't know what he's talking about. He's never even been to Alaska.

Name	Pronounced	Usage
Isabell	ee-zah-BEL	German
Katsu	kah-tsoo	Japanese
Karrie	KER-ee, KAR-ee	English
Ashley	['æʃli]
Gavin	[gævin]
Idowu	-	Western African, Yoruba