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1.
Contraction of 'I would have'.
I'd've tried a little harder if I knew then what I know now.
by anonymous February 05, 2004
 
2.
Short for "I would have"
Combination of "I would"(I'd) and "would have"(would've)
Mother: Didn't I tell you to clean your room!?
John: Well i'd've cleaned it but, ..well i'm lazy.
by Cuckoos July 26, 2009
 
3.
A mother of a contraction.
I'd've is one contractive mother!
by tourettesguydanny June 11, 2006