Get Muddy

A reference to any sort of anal sex

I can't wait to Get Muddy with my girlfriend this weekend!!

To get muddy in the pond

Describes a situation during a conversation between a person from the UK and the US where a word or phrase is misunderstood or not understood.

To get muddy in the pond:

I asked him if he fancied a cuppa and he looked at me like I was mad. The question got muddy in the pond.