Top definition
a word (irish) created by youtuber jacksepticeye to represent the sheer extremity of the situation, a derivation of the words 'by' and 'jesus'
"I'm going to the store Mom" said Pete, *stone flies through the window* , "Bayjaysus" screamed Pete.
by mjamez20 October 26, 2016
Get the mug
Get a bayjaysus mug for your daughter Riley.