When Barb calls it is simply another name for the act of vomiting, puking, upchucking, barfing, throwing up and the many other names.
Barbs call originated in Indiana. It occurred when a young boy told him mother in the morning that he had barfed last night, and in response the mother mistaken his statement that "barb had called last night". So you better hope you don't get barbs call anytime soon!
Last Night I went out to the bars with my buddy for his bachelor party, regardless to say we went a little to hard and barb called me that night i didn't feel too good in the morning.