In the UK what does the term "Windup" mean?

Question

I'm here in the US and my friend used that term but won't tell me what it means

Answer 1

A wind up is a gee up,basically they are trying to get you going. It can also be like a bullshit story or a lie. Thats a wind up. Imagine a wind up toy when ur a kid. U wind it up and let it go.

Answer 2

to tease
to play a trick

they do it to annoy you/make you laugh
its a harmless thing with no malice behind it