1. covered with bushes or underwood;
full of thickets, bushy, woody ...1593
2. somewhat the worse for drink; elated with liquor;
tipsy, half drunk, intoxicated ...1790 Eng. dial.
3. wild, unfrequented ...Bk1911 Scot.
definition 1: from bosk (not recorded between 14th and 19th c., but preserved in dial.) + -y;
or alteration of busky, after Italian boscoso
definition 2: perhaps a humorous use of the above, with the notion of ‘overshadowed’ or ‘obscured’
1593 - The Famous Chronicle of King Edward the First, George Peele;
see Example below
From: The Works Of George Peele
Edited by the Rev. Alexander Dyce
Second Edition, Volume I, 1829
Edward the First