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Wiktionary
toss up

vb. 1 (context idiomatic intransitive English) To make a decision based on chance, for example by flipping a coin or rolling a dice. 2 (context intransitive English) To throw something upwards. 3 (context idiomatic transitive English) To produce, generate. 4 (context idiomatic transitive English) To cook something quickly. 5 (context idiomatic transitive English) To casually mention as an idea

Usage examples of "toss up".

If we can find something for an assistant to toss up, could you smash that with your carbine?

A quarter of the way there he had to stop and toss up his breakfast.