On the ham radio bands, a voicelid is an operator who is transmitting voice within, or partially within, a portion of the band traditionally reserved for data.
For instance, the USB carrier frequencies 14.230 MHz and 14.233 MHz have traditionally been reserved for slow scan television operations (also known as "SSTV") for more than 50 years now:
So with regard to these frequencies, USB voice operation above 14.227 MHz (presuming 3 KHz voice bandwidth, which is generous) and below 14.236 MHz self-identifies the operator as a voicelid, as would (non-traditional, to say the least) LSB carrier point operation below 14.239 MHZ and above 14.230 MHz.
This is true both during non-contest and contest periods. Contests provide no legitimate excuse to intentionally interfere with others — that's not radiosport. That's simply rude, as well as outright forbidden.
This does not apply to USB voice transmissions on 14.230 or 14.233 that are actually SSTV related — those are part of normal SSTV operations.
So take a little time to learn about traditional non-voice allocations on all of the bands you operate within, and carefully respect the tiny bits of bandwidth they occupy. This is one of those important bits of operational knowledge that distinguishes the skilled radio operators from the unskilled ones.