Testosterone induced social suicide in a male.
When a male says something around women that is only appropriate for him to say around other men.
True testosticide will usually result in the surrounding women presenting cold shoulders, giving verbal abuse, or giving physical abuse.
Sam committed testosticide by accidentally blurting out "wow, look at that rack!" while standing with a large group of reserved women and feminists.
When trying to describe something so fantastic that the word alone just doesn't cut it. Something so fantastic that it's fantasticness can only be equalled by the awesome power of the female mammary glands also colloquially know as tits. A combination if "tits" and the suffix "tastic". Titstastic.
Duke: Bro, you have to try some of my weed-flavoured cookies I baked this morning, they are fantastic! Nothing can beat them!
Brent: Oh yeah? Wait till you try my pussy-flavoured homemade icecream with a hint of lemony mint!
Duke: Wow! Now that's beyond fantastic! That is indeed titstastic, bro!