by Boxlicker101
Cock like a horse?s but
Thick as a tree
You may want to consider moving "but" down to the beginning of the next line. At first, I thought you misspelled "but" and had meant to say horse's butt. Besides, it's best not to end a line with a conjunction.
Well, you've got the form,
but so did he.
Either "butt"
or move your but
like she said.