In "Kill Switch" (S5 E11), when our heroes arrest Invisigoth/Esther Nairn, she refuses to give any name except "Invisigoth," and then says "My address is T-O-A-S-T." What does this mean? Is it a reference to the fact that the shipping crate she was living in just got burnt? I don't understand why she would spell it out, if so, which makes me think it may be a computer joke I'm too young to understand.
It seems to be a reference to her abode (a shipping container) being destroyed in the earlier sequence.
She spells out the word toast, as in "to be toast", i.e. to be destroyed.