Noun
(uncountable, slang) Sticky matter accumulated between digits of a foot.
(countable) A stubbed toe. (Can we add an example for this sense?)
(countable) A rock-climbing maneuver entailing exerting force with two opposite surfaces of the toe of a shod foot, against two different rock surfaces, for the purpose of preventing motion of that foot in a direction parallel to both of those rock surfaces.
Source: en.wiktionary.orgtoe-jam