A nigerian-pidgin slang for "Talk" or "Talk to". Mostly used in combination with the Nigerian pidgin dialect.
The slang is used mostly in the deep southern parts of Nigeria, particularly in Warri aka Wafi.
Jovi loves to yahn.
I saw Donatus yahning your girl earlier.
pidginGuy you too dey yahn any how! => englishGuy, you talk too much and without thinking!