Here in America, we also use the term “Ball and Chain”.
[annoying nitpick]
I have been using a CPU that can execute several NOPs in parallell! The newer PowerPCs can execute up to 3 NOPs per cycle!
[/annoying nitpick]
IIRC Signifigant Other (SO) was coined by the Gay community to mean “the person I would Marry if it were legal to do so” Then everyone started using it to mean “this person I share some romance/sex with”