I give up...!

i disagree...... 'Learn how to park! ****'

Kitey's right..... the exclamation mark signifies a full stop...end of sentence, and so the random word at the end is in my view the identity of the **** who left the message

Looks to me like **** was written as an afterthought or even by someone else as it isn't in the same style.
Not everyone is bad in carparks (I still don't trust them though), I recently parked our 911 at Tesco's (Beaumont Leys, Leicester) couldn't be much worse a place. On return to the vehicle a 30's guy and his partener were getting into their car and he said to her to be careful getting into her side and not to ding the Porsche.