shiver my timbers , interj :
A mild oath expressing surprise, disbelief or annoyance. It is stereotypically regarded as being uttered by pirates. Today is International Talk Like a Pirate Day, a parodic holiday invented in 1995 by John Baur (‘Ol’ Chumbucket’) and Mark Summers (‘Cap’n Slappy’), of Albany, Oregon, USA.
Source http://handbookblogger.blogspot.com/2017/09/shiver-my-timbers-word-of-day-for.html
Handbooking 