Definition of headrush:
(n) :
A sudden feeling of dizziness and/or euphoria, such as:
(n) :
a rush due to emotional agitation or excitement, for example when seeing someone one is in love with.
(n) :
nicotine rush, for example in people who seldom smoke, or when smoking on an empty stomach.
(n) :
orthostatic hypotension, due to low blood pressure, for example when standing up suddenly.
(n) :
a rush induced by mind-altering drugs.
(n) :
(figurative) Something exciting or thrilling.