This is fast becoming a ‘well known’ phrase used by impressionable young men throughout England, particularly Leicester.
It is used to show you have gone one better than a friend / or when you have done something that requires recognition from you peers
(jim) "and she said i was better than you..HOW YOU LIKE NOW!"
or in its second form
(andre) "everyone.. I'm finishing early on friday to go down the boozer.... HOW YOU LIKE ME NOW!