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1.
A Sanskrit word used to refer to a practice in Tibetan Buddhism, in which the practitioner creates a sentient being through the power of thought. 'Thoughtform' is a rough English equivalent. Has experienced a revival of sorts in recent years, originally centered around 4chan's paranormal board (/x/), before shifting to the My Little Pony board (/mlp/), and later various independent websites (primarily tulpa.info).
I can't think of a good way to use tulpa in a sentence.
by CaptFlushing August 01, 2012
 
2.
Brony term for imaginary friend.
"I whip out my dick and put it in her vagoo for my Applejack tulpa!"
by Jacal July 18, 2012
 
3.
A vein on the penis that has become enlarged and/or darkened so that it has become obvious and unnatural.
That cock ring was way too small, every vein on my dick was a full-on tulpa.
by Master McMaster July 10, 2011