what by the way means

Ou vle mande Kouman yo di li an Kreyòl?

by the way → anpasan, antwot, kite priyè pran kantik, or kite kantik pran priyè
speaking of → anpalan de
While on the subject → pandan nou sou sijè
Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words