The "Burrito-Looking Machine" (A.K.A. The Aperture Science Handheld Portal Device) is a handheld device used to create portals. This device was first seen during the Season 6 blooper Portal M4R10 - If Mario was in... Portal
In SMG4: Mario Commits Tax Fraud, Yoshi was seen using one of this devices, which he stole from a prison mate, Then proceeds using it breaking himself and Mario out of prison. Yoshi later discards the device, knowing he won't be needed any further use of it.
The "burrito-looking machine" (Portal Gun) is a hand-held device with three black cords coming out. It was designed to fire a colored projectile that creates portals. There is also a white cover below the front side. It has the Aperture Science logo on it, and on the back there is another white cover.