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Stumbled upon this by accident, but I've replicated it a few times now and it does work.
What you need:
Primary weapon where you are close to earning a 10,000 XP bonus (500 kills, 250 headshots etc)
Secondary weapon (Only tested on pistols so far)
Slight of Hand Pro (May not be neccassary)
What you need to do is to get the kill with your primary weapon and immediatly switch to your sidearm, before the 10,000 XP comes up on the screen.
If you do it fast enough the XP will be added onto your secondary also. On a pistol with 0 kills I managed to get just shy of weapon level 9 by doing this glitch once. The video below I was only level 2 with my .44 magnum and the XP maxed it to level 10 and gave me a further 10,000 XP for doing so.
i've tried this with sleight of hand pro and it didnt work for me you must have to be pretty fast i guess then, ive got FPS Freaks on my PS3 this probably slows me down?
maybe if you use specialist killstreak could work I'm going to try it once i get 499 kills
u dont need to use the specialist killstreak, just sleight of hand pro and overkill, so .... but u already nearly got 499 kills?
Edited: Okay guys, you cant do this with overkill, also if you do this with a machine gun secondary its likely to be that its NOT working. Its the best to use a Pistol, then it will work!