Newton sex
When you are about to have sex with a gut but the situation becomes really awkward because they have an incredibly small and disgusting penis, so you tell them you need to go revise Newtons third law as an excuse to get the fuck away
Person 1: Hey how was your sex last night!!!
Person 2: I didn't do it he had a serious case of Newton sex.
Person 2: I didn't do it he had a serious case of Newton sex.