Wiktionary
n. 1 In scuba diving, the situation where the diving regulator continues to supply air instead of cutting off the supply when the diver stops inhale. 2 (cx attributive English) A style of self-service restaurant or cafeteria where customers can select from various food items without waiting in a queue.
Wikipedia
Freeflow (also free flow and free-flow) in underwater diving apparatus is a continuous flow of gas from a storage or supply unit. In scuba diving it is usually undesirable and considered a malfunction, while in surface supplied diving it may be a malfunction or a user selected option in demand systems, or the standard mode of operation in freeflow systems.
Usage examples of "freeflow".
Later he would find out whether it had been reduced to disassociated polysaccharide chains and freeflowing pectins along with the rest of the forest, or whether it had been lifted and transported out of harm’s way.