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A US military aircrew survival knife usually blaze orange in color that has a single side opening switch-activated blade propelled by means of a bar spring. Opposite this is a hook sharpened to cut the shroud lines of a parachute (looks somewhat like a large popcketknife can opener). Sometimes the automatic function is reversed to the hook to comply with local laws regarding switch blade knives or user prefernce. Was made in quantity by Schrade/Walden, Camilus and others from the 1950's to the early 1990's.
Handle is synthetic stag. An updated model, with a stronger coil spring less prone to fatigue and able to be easily disasembled with a hex wrench has superceded the earlier rivited design although the former is still commonly available. It resembles a large conventional pocket knife.
Although e-bay does not permit the sale of switch blade knives, a search for mc-1 will reveal the futility of such a rule.
mc-1 by mike bishop January 18, 2007

Person 1 

The first one in a group, they usually have some sort of relationship with person 2, whether it be good or bad. They usually start a conversation with person 2, and that can stem into different topics
"I agree with Person 1 on this."
Person 1 by Fordalels March 12, 2020

~`!1@2#3$4%5^6&7*8(9)0_-+=qwertyuiop{[]|\asdfghjkl:;"'zxcvbnm<,>.?//?.>,<mnbvcxz'";:lkjhgfdsa\|][{poiuytrewq=+-_0)9(8*7&6^5%4$3#2@1!`~ 

Wow. You're that bored? I didn't even think that was possible.
"You: i need to get my schoolwork done
Also You: types in ~`!1@2#3$4%5^6&7*8(9)0_-+=qwertyuiop{|\asdfghjkl:;"'zxcvbnm<,>.?//?.>,<mnbvcxz'";:lkjhgfdsa\|]{poiuytrewq=+-_0)9(8*[7&6^5%4$3#2@1!`~"

18 and 1 

to work at something and nearly accomplish something great, before failing at the end
Jimmy had an 'A' going into the final exam, but did poorly and therefore, went 18 and 1 in the class.

Entemology: The Patriots were undefeated going into the Super Bowl, but went 18 and 1 for the season.
18 and 1 by D. J. (from PSU) January 11, 2009

192.168.0.1 

Common IP address for routers. The administrative functions of most routers can be manipulated by entering the IP address into a browser. The username is usually left blank, and the password is usually "admin."
h4x0r 1: "Man, RoadRunner changed it so I can't have a network on my cable modem!"

h4x0r 2: "Chillax. Go to 192.168.0.1 and clone the cable modem's MAC address to the router."

(Note: The above conversation was translated from l33t for the purpose of distribution.)
192.168.0.1 by Philbert0 July 24, 2008

HomoSexual Level (HSL) (1-4) 

HomoSexual Level. Levels included are

HSL 1-verbal queerness
HSL 2-verbal queerness of a higher degree and/or bodily touching excluding that certain part of a male's body
HSL 3-Mega verbal queerness with extensive touching of upper and lower body. (Ex. groping)
HSL 4-You just went way to far level. (Ex. dry humping)
HomoSexual Level (HSL) (1-4)
HSL 1-
Bobby: Kevin, have I ever told you your extremely sexy.
Kevin: WTF! You just went HSL 1 on my ass.
HSL 2-
Bobby: Kevin, have I ever told you your extremely sexy. (While rubbing Kevin's back)
Kevin: WTF! You just went HSL 2 on my ass.
HSL 3:
Bobby: Kevin, your so sexy, lemme kiss the tip. (While slowly moving his hand up Kevin's leg)
Kevin:WTF! you just raised it to HSL 3!
HSL 4-
Bobby: Kevin, your so sexy, lemme kiss the tip. (While slowly moving his hand up Kevin's leg)
Kevin:(Pulls Bobby's hand to his crotch while rubbing Bobby's ass) You can kiss my tip whenever you like!