#1 tail end n. the time of the last part of something; "the fag end of this crisis-ridden century"; "the tail of the storm". wn #2 tail end n. any projection that resembles the tail of an animal. wn #3 tail end n. the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?". wn