1) a male whose commitment to nudity stops above the waist. 2) a common phenomenon among cartoon characters wherein the character is deprived of pants; see Donald Duck, Ziggy, Winnie the Pooh, etc.
I got invited to go toBurning Man this year, but was scared off by the sheer number of shirtcockers in attendance.
(verb) To walk around wearing a shirt but no pants or undergarments. Synonym of Donald Duck. Technically applies to men only, but plumbing issues aside, easily applies to women, too. Sometimes a mild pejorative, implying imcompleteness or an unwillingness to commit.
Another name for the Bitlocker whole-disk encryption software provided with Windows, especially when it's not working correctly and you don't have the recovery password.
Idiot: "I forgot my password, can you unlock my computer?" Technician: "No, it's got shitlocker on it you idiot"