( informal ) to drink, laugh, shout, etc. so much that you cannot behave in a sensible way
DRINK, LAUGH, SHOUT, ETC. YOURSELF SILLY
Meaning of DRINK, LAUGH, SHOUT, ETC. YOURSELF SILLY in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005