A cuteish Spoonerism of "bar hopping" used in polite conversation to disguise or mitigate the fact that you went on a serious bender last night or intend to go on one tonight. In the latter instance, it also presages your likely pronunciation of "bar hopping" at about the midpoint of the crawl.
Example 1 ...
Friendly co-worker: You look like shit today, friend.
You: Yeah ... I did a bit of harbopping last night. I'll be OK by 2 o'clock, though.
Example 2 ..
Woo hoo! We iz harbopping tonight! Gonna get my drink on!