Verb, simple past tense of vex (archaic). Example:
What happiness to reign a lonely king,
Vext — O ye stars that shudder over me,
O earth that soundest hollow under me,
Vext with waste dreams?
— Tennyson, Idylls of the King, “The Coming of Arthur”
1) annoyed, frustrated, irritated.
Or, possible new definition: 2) to express annoyance, frustration, irritation via the smart phone medium of text.
Do you vext?