A trunkless drunkard

Hope you know I am just the head of a horse? Funny that you can accuse me of being drunk, Cross-check the possibility of this with your boss, 'Cos how can a horse drink beer without a trunk? Now you want me to walk a straight line, That'd be quite a difficult task, 'Cos without my limbs that can't be fine, Tho' it'll be easy for me if I follow the white track. Now that I've done it, will you allow me to go? My trunk and limbs are seriously missing me now, So, joining them back to my body is my goal, Enough of this our unnecessary row!