Of a person or animal: having buttocks of a specified kind. Chiefly with modifying word.

Of or relating to the posterior or buttocks, or to posterior parts of the body. In later use chiefly humorous.

With modifying word or as the second element in compounds: having a rump, rear, or bottom of a specified kind (cf. assed, adj. 2). Also more…

Of a person: having a bottom of a specified kind. Usually in parasynthetic compounds, as bare-bummed, big-bummed, fat-bummed, etc.

Chiefly humorous. Of or relating to the buttocks or anus. See fundament, n. 2.

Resembling or having the form of a buttock.

Of or belonging to the fundament.

Of or relating to the nates or buttocks.