tossing

from The Century Dictionary.

• noun In the refining of metallic tin, the dipping up of the melted metal in ladles. and pouring it back into the pot whence it came, thus by exposure to the air causing oxidation of the foreign metals and other impurities which accumulate as a scum on the surface of the refined tin.
• noun The act or operation of one who or that which tosses; specifically, a mining process (also called chimming) which consists in dressing ores by the method described under toss, v. t., 3.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of throwing upward; a rising and falling suddenly; a rolling and tumbling.
• noun A process which consists in washing ores by violent agitation in water, in order to separate the lighter or earthy particles; -- called also tozing, and treloobing, in Cornwall.
• noun A process for refining tin by dropping it through the air while melted.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Present participle of toss.
• noun The motion of something that tosses; a throwing or sudden rising and falling.
• noun mining The process of washing ores by violent agitation in water, in order to separate the lighter or earthy particles; tozing.
• noun A process for refining tin by dropping it through the air while melted.
• adjective vulgar, colloquial Used to disparage or curse someone or something.