plum

(noun) any of several trees producing edible oval fruit having a smooth skin and a single hard stone. Synonyms: plum tree.

(noun) any of numerous varieties of small to medium-sized round or oval fruit having a smooth skin and a single pit.

(noun) a highly desirable position or assignment. Example: "A political plum."

(adv) exactly. Synonyms: plumb. Example: "Fell plumb in the middle of the puddle."

(adv) completely; used as intensifiers. Synonyms: clean, plumb. Examples: "Clean forgot the appointment." "I'm plumb (or plum) tuckered out."