1) Aid for loosening up 2) Sex toy 3) Slang for an artificial penis 4) Stiff competition for a man 5) Vibrator 
A dildo is a sex toy, often explicitly phallic in appearance, intended for bodily penetration during masturbation or sex with partners. == Description and uses == A dildo is a sexual device resembling an erect penis in shape, size, and overall appearance. Some expand this definition to include vibrators. Others exclude penis prosthetic aids, which...
• (n.) A columnar cactaceous plant of the West Indies (Cereus Swartzii). • (n.) A burden in popular songs.
Dil'do noun A burden in popular songs. [ Obsolete] « Delicate burthens of dildos and fadings.» Shak. 
Type: Term Pronunciation: dil′dō Definitions: 1. An artificial penis; an object having the approximate shape and size of an erect penis, and commonly made of wood, plastic, or rubber; used for sexual pleasure.
Dildo is slang for an artificial penis.
[n] - a mechanical device that substitutes for an erect penis to provide vaginal stimulation
noun a vibrating device that substitutes for an erect penis to provide vaginal stimulation
an artificial erect penis, used as a sexual aid.