Definitions of modern slang defined by the Urban Dictionary.

Barking spider:
What farts are blamed on when there is no dog available.

Barsexual:
A college-age girl who kisses other girls in bars and clubs, usually for attention and the approval of men.

B.F.F:
Best Friends For ever.

Boo:
1. Boyfriend or girlfriend
2. Word used to scare people

Consumerican:
An individual suffering from the particularly American brand of consumerism.

Earjacking:
Eavesdropping on a conversation that you have no business hearing.

Jump off:
1. a casual sexual partner or girlfriend
2. a woman of dubious sexual practices
3. anything new and/or hot; especially in reference to a party or material item.

Manorexia:
The male version of anorexia nervosa, or any general wasting away of the body in men. This eating disorder is commonly seen in starlets but is now affecting men, where they take on the wasted appearance of starving children in third world countries.

Moneymoon:
The time after your purchase of a good or service and before 'buyer's remorse' happens.

Say word:
When you hear something, but you don't believe it, usually out of shock.

Slacktivism:
The act of participating in obviously pointless activities as an expedient alternative to actually expending effort to fix a problem.

Tri-sexual:
The definition of someone who will "try" anything sexual.

Wikidemia:
An academic work passed off as scholarly yet researched entirely on Wikipedia.