look up any word, like donkey punch:
 
1.
when a delorean hits 88 and travels through time
Doc Brown "when this baby hits 88 your gona see some serious shit"
by duderob92 June 19, 2011
 
2.
when reuben is on the front lines of a war
Kristen: OMG, THEY'RE INITIATING THE DRAFT
Reuben: We could be in some serious shit, literally.
by reubz March 28, 2012
 
3.
1. Commonly used as a response to anothers statment of disbelief in a questioning manner.

2. Also used to add severity to a description.
1. "Did you hear he fucked that fools lady?" Serious shit?

2. Two thirty round clips velcroed together with hollowpoints for an AK-47 is some serious shit.
by Bob Jimenez December 27, 2004