It’s approximately as funny as misogyny. If you are the type of person to laugh at a sitcom character making a sexist comment while patting his wife on the ass as she walks by, you are probably the type of person who incorporates “sammich” into their vocabulary and you have an awful, awful sense of humour. Feminist pretensions aside, it is clear that “GET IN THE KITCHEN” and “MAKE ME A SAMMICH!” are repulsively overdone “jokes” at this stage, and just weren’t very clever to begin with.
If you’re a fan of the JUST RANDOM variant usage pattern of this word, recognise its sad origins and stop assuming that speaking like a child and/or redneck makes you funnier.
You can never say this. It is a stupid word for stupid people.
Please, link others here. You may also peruse the other words and phrases nobody should say or ruin.