large pectorals
When the pectorals tag is not enough and the chest is noticeably larger. Frequently with muscular males.
As a rule of thumb, use this tag if the pectoral muscle looks about the same or greater in diameter as the character's facial area.
Some fujoshi artists also emphasize the pectorals by making them large and sometimes breast-like. In that case the manboobs tag may also apply.
Examples:
Pectorals: post #4312854, post #4338786, post #4307507 post #4165068
Large pectorals: post #4329551, post #4344054, post #4337175
Manboobs: post #4071939, post #3372363