This is quite tasteless… a betrayal of brutalist honesty. And the dildo thing is plainly disgusting. Let’s all be gentlemen and keep that sort of thing off the Net.
The tool used in construction for releasing trapped air bubbles out of poured concrete is called a concrete vibrator (SFW if anyone cares to Google for it). A vibrating ... ahem, personal toy is actually rather a clever substitute for a small scale project like this.