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We characterize the extreme heartbeat star system MACHO 80.7443.1718 in theLMC using TESS photometry and spectroscopic observations from the MagellanInamori Kyocera Echelle (MIKE) and SOAR Goodman spectographs. MACHO80.7443.1718 was first identified as a heartbeat star system in the All-SkyAutomated Survey for SuperNovae (ASAS-SN) with $P_{\rmorb}=32.836\pm0.008\,{\rm d}$. MACHO 80.7443.1718 is a young (${\sim}6$~Myr),massive binary, composed of a B0 Iae supergiant with $M_1 \simeq 35 M_\odot$and an O9.5V secondary with $M_2 \simeq 16 M_\odot$ on an eccentric($e=0.51\pm0.03$) orbit. In addition to having the largest variabilityamplitude amongst all known heartbeats stars, MACHO 80.7443.1718 is also one ofthe most massive heartbeat stars yet discovered. The B[e] supergiant has Balmeremission lines and permitted/forbidden metallic emission lines associated witha circumstellar disk. The disk rapidly dissipates at periastron which couldindicate mass transfer to the secondary, but re-emerges immediately followingperiastron passage. MACHO 80.7443.1718 also shows tidally excited oscillationsat the $N=25$ and $N=41$ orbital harmonics and has a rotational period of 4.4d.

The Loudest Stellar Heartbeat: Characterizing the most extreme amplitude heartbeat star system