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1.
abbreviation of 'where did' (past) or 'where do' (present/future) as a prefix to a question, arisen from slang or quickness of speech. Similar words are who'd, when'd, why'd, how'd, etc, with the relevant meanings.
where'd you get that suit?
where'd you want to go tomorrow night?
by Stephen Arnold February 25, 2007
 
2.
1. contraction of where did:

2. contraction of where would:
Where'd you go on your holiday?
Where'd you like to go?
by SandySh February 17, 2011