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A father who develops an erection only when he feels at home in a particular environment or social situation, such as in his own bed or in the company of his wife.
For fear of attracting peg dads, some moms avoid children's play groups frequented by relaxed, natural fathers; other moms find the company of peg dads enjoyable, and seek out such groups.

Father was completely comfortable on stage but many avoided his shows because of his reputation as a peg dad.

Over time, Renee's soothing manner turned the nervous father of three into an easygoing peg dad.
by grammarboffin September 26, 2014
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