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"
Someone spending far more time on a task than is needed by a typical person. One who takes his/her "sweet ass time" takes far longer than he/she needs to.
Stop taking your sweet ass time getting your homework done. Stop taking your sweet ass time cleaning up the kitchen. I'd love to pick my car up from the mechanic, but they are taking their sweet ass time making the repairs.