Hot button
A hot button is a topic in someone's mind that when discussed makes them offended or very passionate about the issue. These things can be about people, religion, politics, possessions or passions.
When I talked to my girlfriend about her dead father, she got really pissed off and slapped me in the face. I guess that was a hot button issue for her.
Hot button
The clitoris
Bill: hey girl can I press your hot button?
Lexi: oh bill yes you can touch my hot button
Lexi: oh bill yes you can touch my hot button
Belly Button Hot Tub
When a guy is sleeping and has a wet dream and ejaculates into his belly button.
Dude, Last night was so weird, I had a dream I was having the sex, and i woke up to a belly button hot tub.