A name called to people who watch future episodes of a box set without the expressed permission of original box set party. Often these persons will plead they couldn't help it and on occasions with promise not to do so. Often associated with those with poor morale judgements or weak resolve.
'you promised, you even arranged a time when we were going to watch episode 4 and 4,your nothing but a boxjacker'
by Betty wins February 8, 2020