1) Act smitten 2) Be enraptured 3) Beatlemania reaction 4) Become overcome 5) Become rapturous 6) Bieber fever reaction, often 7) Black out while being crooned 8) Blackout while young FAS sang 9) Deliquium 10) Emulate a Ricky Martin fan 11) Exhibit faintness 12) Faint 13) Faint away 14) Faint from emotional overload 1) Deliquium 2) Faint 3) Passout 4) Syncope 
• (v. i.) To sink into a fainting fit, in which there is an apparent suspension of the vital functions and mental powers; to faint; -- often with away. • (n.) A fainting fit; syncope.
Swoon intransitive verb [ imperfect & past participle Swooned ; present participle & verbal noun Swooning .] [ Middle English swounen , swoghenen , for swo...nien , from swo...en to sigh deeply, to droop, Ang...Swoon noun A fainting fit; syncope. 
Swoon is British slang for to fake being knocked-out, to take a dive.
to faint; lose consciousness. · to enter a state of hysterical rapture or ecstasy: The teenagers swooned at the sight of the singing star.