Top 10 unbelievable historical concurrencies. BiPAP is a term that is sometimes used colloquially to refer to bilevel positive airway pressure (BPAP). A BiPAP machine, which is more accurately called a BPAP machine, is a breathing apparatus that helps its user get more air into his or her lungs. Created in the 1990s, the BPAP machine is derived from the continuous positive airway pressure (CPAP) machine.