From The Collaborative International Dictionary of English v.0.48:
Dor \Dor\, n. [Cf. AS. dora drone, locust, D. tor beetle, L. taurus a kind of beetle. Cf. Dormouse.] (Zool.) A large European scaraboid beetle (Geotrupes stercorarius), which makes a droning noise while flying. The name is also applied to allied American species, as the June bug. Called also dorr, dorbeetle, or dorrbeetle, dorbug, dorrfly, and buzzard clock. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Dor \Dor\, n. [Cf. Dor a beetle, and Hum, Humbug.] A trick, joke, or deception. --Beau. & Fl. [1913 Webster]
To give one the dor, to make a fool of him. [Archaic] --P. Fletcher. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Dor \Dor\, v. t. To make a fool of; to deceive. [Obs.] [Written also dorr.] --B. Jonson. [1913 Webster]