CTFU is an acronym that stands for "Cracking the F*ck Up." Similar to 😂and LMFAO, it's frequently used as a substitute for LMAO to express laughter.
While CTFU predominantly signifies 'Crack the F*ck Up,' this acronym also holds other meanings, such as "Cheer The F*ck Up," among others.
CTFU Example
After reading a story about a guy boasting about how many chicks he gets, someone might comment "CTFU, this dude looks like Steve Urkel."