The adjective bibulous describes something that is highly absorbent, like a towel or sponge that soaks up liquid well. A bibulous person, however, is someone who likes to drink alcohol.
Bibulous, pronounced "BIB-you-luhs," comes from the Latin word bibere, which means "to drink." You may recognize this root in the verb imbibe, which often means "to consume alcohol." As it applies to people, bibulous means "likes to drink alcohol." So don't make the mistake of using it to describe someone who seems to soak up information or understand complicated ideas quickly.