look up any word, like rimming:
 
1.
From "semi" and "ars", hence any half-arsed discussion.
Monty: Hello Cuthbert, let's go spend peoples money on a pointless seminar to massage our own egos.
Cuthbert: Excellent idea, I'll bring the scones and Giles can make the tea.
by Easy Rider August 27, 2004
 
2.
"to impregnate with knowledge". It is actually closely related to the word "semen" and most generally, "seed".

Practically speaking, a seminar is a gathering where people recieve knowledge of some sorts.
Yo, i think im pregnant B. I just went to a seminar.
by FTD May 22, 2005