Blend of dildo + don't.
dildon't (plural dildon'ts)
- (humorous, informal) A poor-quality dildo.
2007 May 12, FastWolf, “Re: Re: i like paris hilton (off topic, am i ever on topic?)”, in alt.drugs.hard[1] (Usenet), message-ID <ft2d43t7k9injhqvlhfssg5c8n89eejim3@4ax.com>:Call me old fashioned, but the cyberdong virtual dildo just didn't do it for me. […] PS= Does that make the cyberdong a dildon't? ... okay I apologize <g>
2010 August 31, Nemo, “Re: Women's Equality Day”, in alt.humor.puns[2] (Usenet), message-ID <uHZeo.2695$w13.2148@newsfe08.ams2>:She can't. The big strap-on dildo she's wearing for the day will get in the way!
And when its batteries run out, it becomes a dildon't!
2015 November 28, Erika Moen, Matthew Nolan, “The Toys That Live in our Bedroom”, in Oh Joy Sex Toy[3], retrieved November 11, 2016:[the link points to an NSFW webcomic]
We've tried a few dilDON'Ts in our life... But I assure you that [dildo brand names] are our top two dilDOs.