A person, hand, or hair that is breathtakingly attractive. Sometimes called a HSU.
"Have you seen young Eric's hand this morning? It must have spent all weekend at the spa, cause to me, it's a HSU, highly sawable unit!"
A person or hair, of above average attractiveness, usually a female, who would be considered for fornication.
"Have you seen Eric's hair? Boy oh boyardee,
I would saw into that unit, his hair is indeed a sawable unit!"