A retarded exclamation point is the random numeral "1" that is mistakenly typed at the end of an exclamatory sentence when someone accidently lets go of the "Shift" key while trying to type an exclamation point (!) on a keyboard.
Dude One: Guess what I did last night
Dude Two: What?
Dude One: I got some of Trisha's sweet ass
Dude Two: WHAT1
Dude One: Huh? What the hell does "WHAT1" mean?
Dude Two: Oh, sorry man...retarded exclamation point.
timmytimmy09 said: Matt and Jack are going out now.
BigBootyAyee 2334598 said: THEY ARE?!
timmytimmy09 said: Hah, just kidding I just wanted to see you use exclamatorization
A chicks vag and asshole combination package makes an exclamation point (!). Notice the line (vag) and dot (anus) and separation of the two entities (taint).