Put simply, it was a phone call from just a couple of days ago in which "Mike" tells Jace that he is under attack by DICKSQUAD radio waves and mind control attacks which are actively attempting to "turn" him gay and give him AIDS. Jace freaks out, and "Mike" advises him to remain calm and wrap himself in tinfoil (or, rather, to wrap the top of his head, his dick and his chest in tinfoil, and to insert a tinfoil spike into his anus). Jace tries to do so, but in the process asks his mom for more tinfoil while wearing his new tinfoil hat. Gail grabs the phone and starts demanding to know if the caller is a "non-Christian", before hanging up - Jace can be heard shrieking in the background.