plural noun Informal.
Origin of pecs
Examples from the Web for pecs
In a video called Conversions, he burnt the hair off his chest and pushed on his pecs to make them look like breasts.Vito Acconci Named Designer of the Year by Design Miami|Blake Gopnik|October 24, 2012|DAILY BEAST
Unfortunately, not even a close up of Kutcher's pecs could save this movie from limping straight to video.
Stone also suggests an exercise called chest boosters to work your pecs, which should also be done sitting down.
His shirt clung to his pecs and was tailored down to his narrow waist.Makers|Cory Doctorow