The act, normally by a drunk man in a nightclub, of placing one's hand atop a girls head in the style of a blessing.
The person committing the act is ostensibly harmless, its not meant as an aggressive act, and mostly gets laughs, but sometimes its not appreciated.
It originated in Sams Nightclub in Brentwood, Essex.
Q: Did you have a goodnight last night?
A: Yes, Glen was so drunk, he was poping all night.