most aggressive opening that is regularly played at club level is probably the Danish gambit. most aggressive opening that is regularly played by GMs has to be the dragon, both players (but especially black) are constantly on the verge of desaster in many lines...
Most Aggressive Openings?
very aggressive and sound is the veserov. it focuses on quick piece play and 0-0-0,not unlike the 2.d5 nimzowitsch defense.
I like the Bishop's Opening and its cousin the Vienna Game where an early f4 often leads to a K-side P-storm by White.
I played the King's Gambit once in my life in a rated game, just last month and won and I'm sure I'll try it again.
1. b4 seems aggressive to me.
it really isnt. they are some lines where white can play for a gambit but these are limited to only some of black's responses. almost always the opening becomes a closed game. the e5 bxb4 lines its black who starts aggressive and white plays catchup.
i think he was making a little joke?
i dont get it.
https://www.poets.org/poetsorg/poem/hamlet-act-iii-scene-i-be-or-not-be

You can get a sampling of the most aggressive openings imaginable if you play the chess.com computer at levels 5 or 6. It acts as though chess were a mate in three game at the outset. You will find the computer's queen, bishops, and knights all over your position in just a few moves, often to the computer's disadvantage, since a little pawn tickling can drive the pieces away -- sometimes.