Its Human Resources BS at its worst, generally served for free at career fairs at a variety of universities all across America. Examples of "dat HR sizzurp" include: offers of opportunities to work abroad, face to face client meetings, words such as strategy and management and opportunities for development. These things never happen at your entry level position or internship, but are commonly discussed at said career fairs.
Dat sizzurp is generally so strong that it can only be sipped, and seems great while your leanin' on it. It is highly intoxicating. Generally, once one's career at said firm begins, the user soon realizes that the HR sizzurp is a terrible concoction with horrific side effects.
See Also: The HR Koolaid, a term commonly used on "GettingDrunkinFirstClass.com".
White Privileged Kid: "All John talks about is his new job at Management Consulting Firm X, but he's yet to find out that on the job, he'll just be making Powerpoints all day."
Other White Privileged Kid: "Yeah he's still leanin' on dat HR sizzurp."