The "twinkle in the eye" of female (and sometimes male) Obama supporters whenever Obama speaks. Typically a person experiencing an Obamagasm can be seen staring doe-eyed with their mouth agape while hanging on every word Obama is saying. Often, the person will be bouncing with excitement or swaying on their feet. Obama's inauguration in Chicago is considered to be the largest simultaneous "Obamagasm" the history of the planet has ever witnessed.
Those prone to having an "Obamagasm" are typically limited in their mental faculties and incapable of rational thought. They are stimulated by the "image" of Obama and the ideas of "hope" and "change," rather than by the content of Obama's words; which those prone to an "Obamagasm" are usually incapable of understanding or interpreting anyways. "Obamagasms" are typically so strong that anyone who has experienced one is likely still recovering from the climax and is still incapable of finding any fault whatsoever with the object of their affection and sexual gratification: Obama.
"Damn man, Obama came on t.v. at Starbucks last night and all the college girls who have never taken a Poly Sci class in their lives had an Obamagasm as soon as he started speaking! Took the janitor an hour to clean up the mess..."