pipes
n.pl.— «Over the subsequent years, Melissa started to fill out with lean muscle; her young, male training partners started calling her “Pipes,” a begrudgingly respectful nickname that pays homage to her rock-hard guns and true training grit.» —“Designing delts” by Marty Gallagher Muscle & Fitness Aug. 1, 1997. (source: Double-Tongued Dictionary)