Flog one's dolphin vulgar slang
A vulgar slang used to refer to male masturbation
To masturbate
Used to describe touching or caressing one's genitals.
The phrase starts with a verb, therefore, it needs to conjugate within the sentence.
Something or someone has been somewhere and become so familiar that it is hard for you to accept that place without them.
He was here for such a long time, so he was part of the furniture.