The offical meaning of Whit Monday.

Thank you for your interest in the Islands of The Bahamas. Whit Monday is
a religious holiday. It is the celebration of the birthday of the
Christian Church dating back to Pentecost when the Holy Spirit descended
upon those present and the Apostle Peter gave his great sermon during
which time some 3,000 persons were added to the church. It is thought to
be called "Whit" which is an abbreviation of the word "white" which was
what was worn by the women. Hope this helps.
Maxine Williamson
Sr. Manager
Communications Department