The word 'skidding' is a gerund, a verbal noun, the present participle, present tense of the verbto skid that functions as a noun. The present participle of the verb also functions as an adjective.
Examples:
These tires are designed to prevent skidding. (noun)
I came skidding to a halt, just missing the car ahead of me. (verb)
The skidding vehicle was stopped by the guardrail. (adjective)