Top Definition
The muscles of a man (or, perhaps, a woman) that are startling--be it because of his composure or other physical features that do not make you suspect muscular characteristics. Surprise muscles are most common in the shoulder and arm area, as those may be hidden by a shirt.
As he took off his shirt, she did a double take at his surprise muscles.
by merekat August 29, 2009
7 Words related to surprise muscles

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