a yellowish-beige colour

a buff envelope

a stout dull yellow leather with a velvety surface

a stick, wheel, or pad used for polishing

polish (something)

he buffed the glass until it gleamed

make (an element in a role-playing or video game) more powerful

there are cards that'll buff your troops

a person who is enthusiastically interested in and very knowledgeable about a particular subject

a computer buff