bootycall
when you are sitting down and your cell phone is in your back pocket, and when it rings-your butt answers the phone.
Example:
Someone: "I called you earlier, and you picked up, but i couldn't hear you talking...what was that?"
You: "Oh that? That must have been a bootycall."
Someone: "I called you earlier, and you picked up, but i couldn't hear you talking...what was that?"
You: "Oh that? That must have been a bootycall."