The combination of ass dialing and FaceTiming. The act does not necessarily have to be specifically caused by the gluteus maximus, but can refer to any accidental cause. Usually makes for extremely awkward moments and always happens when you are talking about the person or place you AssTimed. Not to be confused with "sexting".
Steph: "How did I FaceTime Cook's Cafe??"
Tyler: "Hahaha, it looks like you AssTimed the local diner... aaaaawkward"
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