The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with damn well
damned well. Certainly, without doubt; emphatically. For example, You damn well better improve your grades, or I know damned well that he's leaving me out. The damn in this phrase is mainly an intensifier.