Sentence:  I' troth, Sir Grandpaw, quoth the Ass, I am somewhat a Blockhead you know, and can't for the heart's blood of me learn so fast the Court-way of speaking of you Gentlemen-horses; I mean don't you <WSD>Stallionize</WSD> it sometimes here among your metal'd Fillies? 
Meaning of the word marked with <WSD> tags:  To behave like a stallion, especially to engage in sexual intercourse.