keister vs tail end

keister

• The anus or buttocks. 

• A suitcase or satchel. 

• To conceal something in one's rectum 

tail end

• The hindmost part of anything (a person, animal, or object), the rear end; the butt, buttocks; hindquarters, rump. 

• The last part of a period of time, event, or situation; the concluding or final part.