A Whack Attack is when someone or something causes you frustration, mystifies you, disrupts your train of thought or simply makes you want to freak out.
Someone who thinks they no what they are doing all the time but really don't have the slightest fucking clue. Also they think they are pro at everything they touch and bully other people who aren't as skilled as them. Basically an arsehole.
WhackaWhacka ''Get a kill, scrub'' ''I don't know'' ''WILL!'' - and many more.
Another use of "whack attack" is the act of masturbathingmultiple times without taking a break to relax or recharge. After the orgasm, one must sustain an erection and achieve another orgasm for it to be considered a whack attack.
Also, the word whack attack can be used to describe someone/thing that would cause someone to hace a whack attack.
Every time my roommate goes home for the weekend, I have a massive whack attack
That girl is really hot, she makes me want to hav e a whack attack