"Birl = boy-girl" is a made-up meaning that's not recognized in any real dictionaries (urbandictionary.com doesn't count). Stop removing the real meaning of birl (to rotate a log by treading on it) with this made-up non-word.
"birl" meaning boy-girl does not meet the criteria laid out 
Attestation “Attested” means verified through Clearly widespread use, Usage in a well-known work, Appearance in a refereed academic journal, or Usage in permanently recorded media, conveying meaning, in at least three independent instances spanning at least a year.
A quick Google search shows that "birl" meaning boy-girl does not meet any of the above criteria for attestation. Please do not add that meaning, much less delete the widely accepted meaning (to spin, or to cause a log to spin by treading on it) again.
Wikipedia Edit History
* (cur) (last) 19:15, 27 March 2006 18.104.22.168 [rollback] [proxycheck] * (cur) (last) 10:01, 12 March 2006 SteinbDJ (Added stub tag) * (cur) (last) 10:10, 29 January 2006 Ilagleti
The word Birl means a few things:
BIRL v. To revolve a log in the water while standing on it.
--jenlight 13:48, 6 March 2006 (UTC)
In bagpiping, a birl is a type of grace note movement that quickly switches between low-A and low-G a couple times, producing a low rippling sound.
Reference: http://www.mcnabbs.org/andrew/comments/pipemusic/ (among others)
Darin McGrew 08:17, 19 November 2009 (UTC)