Much like the popular phrase "that's what she said", "that's what I told my first wife" can apply to male only references. The first known use was by Michael Thor Lengies Sept. 2012.
Perfect set ups:
"It's doesn't get any harder than this." "That's what I told my first wife."
Sarcastic:
"I always wear condoms." "That's what I told my first wife."
Out of no where:
"I've got a date at 9:00." "That's what I told my first wife."
Self degrading humor:
"I'm just not a one woman man." "Yeah, that's what I told my first wife."
I hate legally blonde and his skunk head wife and there home alonelooking receding line twerp of a son that cries himself to sleep and still wets the bed.
I don't buy the schmegegge about Morty sleeping with Moira.
His version of the story was pure schmegegge.
The whole schmegegge was made up to get Liz a little bit of attention.
Looking or experiencing something nice after witnessing something horrid like a disgusting gif or a disturbing video. Typically used as eye bleach are nice images of whatever makes the disturbed person happy.