Anything a person decides they are going to do one day. A procrastinator's favorite verb.
Yeah, yeah, that's another thingamado... maybe next week... we'll see!
A whore, slut, or any woman who uses objects or sells herself for sexual pleasure.
Man, that chick's a thingamado!
What you call something when you can't remember what it's called. See whatchamacallit
Person 1: "Hey where's that thingamado?"
Person 2: "The what?"
Person 1: "You know, that thingamado I was using earlier."
Person 2: "Ohhhhh, I know what you're talking about. Yeah the thingamado is next to the whatchamacallit."