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1.
meaning the person you have directed 'biatchymondo' at is either being a bitch or is simply pissing you off for no apparent reason
situation 1

alan: hey dude! wanna go out tonight?? we should so hit on some hot chicks/boys maybe!

Tom(big man): man....your a freaking biatchymondo

situation 2

alan: heyyy whys my computer going soo slow tom??? uhhh i cant get on to my myspace to look up hot boys!!

Tom: mate, the comps being a biatchymondo
by Thomas Hunt March 17, 2008