You all would not have had, had I had not have had you all to have had.

The long version of y'all'd'nt've'd'd'i'd'nt've'd'y'all't've'd, which is the longest grammatically correct contraction. It means without me, you couldn't have done it.

P 1: We did it!
P 2: You all would not have had, had I had not have had you all to have had."