Someone that is twice as dumb as a simple dumb person.
Jim was driving drunk, smoking a joint and texting when he got pulled over? What a double dipshit.
The fleeting feeling a person gets right after they hit the send button on a text they immediately want back.
Related to the ignosecond, the feeling a person gets upon seeing their keys in the ignition just as the locked car door closes.
I was really mad while I was typing, then had an ignotextsec as soon as I sent it.