Refers to the strength or intensity of the cigar. Full body and full flavor are different.
Habanos Bolivar Belicosos would be considered a full body - a real kick in your taste buds - sharp and tends to be peppery , nicotine hit for sure and a buzz, especially for beginners . Great for special occassions or evening smoke.
The Montecristo No 2 is a mild stregth in my opinion.
Full Flavored - taste like say coffee, cherry vanilla ( sweet ). Low nicotine, not much of a buzz...soft and mellow to the palette. But be carefull with this since this also falls into the same category and infused cigars which I avoid.
Fonseca is a really mild sweet natural blend.
Learn to retrohale = big difference