Top definition
to press one's bare ass up against a window of sorts, often in a moving vehicle, for the purpose of displaying it to the unfortunate fellows on the other side of the window.
Every time we see a school bus on the road, we pass it and press ham.
by brandon hall November 30, 2005
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
To "moon" or show your bare ass to someone while pressing the ass up against glass.
Jamie decided he was going to press ham on the window at the local Mc Donald's and all the cheerleaders screamed.
by Eddie Bell May 27, 2008
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3
to spread your ass cheeks and touch your cornhole up against something or someone.
My ass was ripe when I press hammed that persons face when they fell asleep at the party.
by William Wells December 12, 2005
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4
to sit, bare-assed, directly on a toilet seat.
Hell no, I don't press ham on public toilets.
by Ivan January 23, 2004
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