be foaming at the mouth

foam | American Dictionary

foam
noun[ U ]
us/foʊm/
a mass of small, usually white, bubbles formed on the surface of a liquid:
The waves were high and capped with foam.
Foam is also a type of light material made by adding gas bubbles to a liquid, then letting it cool, used esp. in packaging.
foam
verb[ I ]
us/foʊm/
to produce a mass of small bubbles:
The suds in the sink foamed up when she added hot water.

Examples of foam

foam
The rapid viscosity decrease and rather small hydrogen diffusion coefficient at glass transition temperature result in "foaming" of beryllium hydride in the course of thermolysis.
Equation of state data experiments for plastic foams using smoothed laser beams.
X-ray diagnostic applied to the study of shock wave propagation in foams.
Research also was begun on forming hollow polystyrene target shells by foaming filled granules overheated by water.
Recent advances in laser-plasma experiments using foams.
One example of failure to do this was the case of flat roofs after foamed plastic insulation boards were introduced to achieve higher thermal insulation standards.
Effects of microstructure on shock propagation in foams.
42 ns in the cases of 1.0 mm and 0.5 mm foams.
42 ns in the cases of 1.0 mm and 0.5 mm foams, respectively.
Time-resolved x-ray imaging of high-power laser-irradiated underdense silica aerogels and agar foams.
The agar foams were produced by a freeze-drying method, where the polymer solution is rapidly frozen and the solvent is removed by a vacuum drying process.
The foaming glass of beer, also placed on the pedestal, suggests perhaps the indiscriminate judgement of men, who put beer and women in the same category.
Consequently, it cannot accept the amendments on recovery, in particular in relation to foams.
From Europarl Parallel Corpus - English
They pose no problems for the current generation of fire-fighting foams.
From the
Hansard archive