In mixed company, he sometimes pulled down his pants to scratch his rear end.
At the rear end of the park is a wall or divider maybe six or seven feet high and about twice that wide.
Not by moving backward, it seems, but by moving the cells in its head to its rear end.
(also rear) The buttocks; ass: She's a pain in the rear end (1937+, variant 1796+)verb
To hit a car from the rear: his Grand Am was rear-ended (mid-1970s+)