A species of grape native to the Ozarks, Vitis rupestris.

(simile) Extremely rare or scarce.

(games) A popular children's game using three hand signs representing rock, paper and scissors, frequently used as a tiebreaker.

Alternative spelling of rock and roll

A rodent species of the Khammouan region of Laos, Laonastes aenigmamus

plural of Laotian rock rat

(slang, Britain, idiomatic) A person ignored or sidelined from an activity

(simile, sometimes sarcastic) to travel through the air with little or no benefit from aerodynamic lift

Extremely stupid.

(simile, slang) Very stupid.