Suck It is David Wallace's product idea in the episode "Sabre." It is a children's vacuum which sucks up toys, teaching kids to clean up their toys. The patent for the product was purchased by the U.S. military for $20 million, as was revealed to Andy by David himself during a fundraiser dinner in the episode "Fundraiser." A slideshow on the official Office website shows how David Wallace designed Suck It to work for a variety of purposes, including cleaning up radioactive and nuclear waste. This is possibly how the U.S. military will use or used it.
He also made a song for Suck It called "Suck It".