Head Trap

When you are taking a shower with your partner and you drop the sponge, then as they go down to get it you guide their head to your "head" and start the bobbing. As in .. oops there's a dick in your mouth. Also known as spongebobbing.

I always drop the sponge or soap when showering with my girl, that way I can guarantee a blow job by getting her in a Head Trap.