gams (n.) "legs," 1781, low slang, probably the same word as gamb "leg of an animal on a coat of arms" (1727) and ultimately from Middle English gamb "leg," which is from French (see gammon). Now, in American English slang, especially with reference to well-formed legs of pretty women, but this was not the original sense.

If Amy would slow down a bit, her many insightful comments would be easier to understand.